DeWalt 3/8" x 5" x 10" 2 Cutter Spline Shank Rotary Hammer Bit

3/8" x 5" x 10" 2 Cutter Spline Shank Rotary Hammer Bit

Features

  • Carbide tip for increased cutting surface and longer bit life
  • U-shaped flute for debris removal during drilling
  • Open-head design channels dust into the flutes
  • Hardened core to reduce bit breakage
  • Spline shank for rotary-hammer compatibility

Specifications

Number Of Pieces 1
Product Diameter [In] 5/8
Product Length [In] 16
Product Pack Quantity 1
Working Length [In] 11

Rotary-hammer masonry drill bit with a carbide tip, U-shaped flute and hardened core. The carbide tip increases cutting contact for longer life, the U-flute clears debris during drilling, and the open-head design directs dust into the flutes. The hardened core helps reduce breakage.

Model Number: DW5710

DeWalt 3/8" x 5" x 10" 2 Cutter Spline Shank Rotary Hammer Bit Review

5.0 out of 5

Starting a day of anchor-hole drilling with a fresh masonry bit can make or break the pace of a job. I put the DeWalt spline‑shank bit through a full week on a rotary hammer, cutting 5/8-inch holes in cured concrete and block, with a mix of horizontal and overhead work. It’s a straightforward piece of kit—carbide tip, U-shaped flutes, open-head design, hardened core—yet the combination mattered more than the spec sheet suggests.

Setup and compatibility

This is a spline‑shank bit, so make sure your rotary hammer is equipped accordingly. It won’t fit SDS-Plus or SDS-Max. On an older spline hammer I keep for demolition and anchor work, the bit seated positively with zero play. The 16-inch overall length with an 11-inch working length gives a useful reach for through-holes and deep embedments without being unwieldy. At 5/8-inch diameter, it hits a sweet spot for common mechanical anchors and epoxy anchors where that diameter is specified.

With longer bits, startup alignment is often where errors creep in; the shank engagement here felt solid, and I didn’t fight the typical first-second wobble I’ve seen with looser tolerances.

Build and design

The two‑cutter carbide tip is brazed cleanly with a visible, even land. It’s not a fancy multi-cutter geometry, but that’s not necessarily a knock—two cutters tend to clear chips quickly and stay fast in plain concrete. The open-head design funnels dust directly into the U-shaped flutes, and those flutes are relatively deep for this diameter, which helps with evacuation in deeper holes.

The hardened core feels stout. Long bits can flex and ring under load; this one stayed straight even when I had to lean into a dense slab. You can tell DeWalt aimed for durability over a featherweight feel. It’s a single piece, no welded extensions, which matters when you’re hammering at full power.

Concrete performance

In 4,000 PSI cured concrete, the bit cut confidently. The hammer’s rhythm stayed smooth, and the bit didn’t bog once the flutes were full. I noticed the open head truly does its job: dust channels off the tip quickly, so the carbide stays cooler, and the bit maintains its bite deeper into the hole. With two cutters, the drilling pace was brisk. I wouldn’t call it surgical, but it’s efficient—especially in long, straight runs of repeated holes.

In CMU and older, harder brick, the bit tracked cleanly and resisted skating when starting. I always tap a small divot or use the hammer’s low-impulse setting to get the tip seated; after that, it stayed on line with minimal wandering. Breakout on the exit side of block was modest, which I attribute to steady evacuation and not having to repeatedly stall, reverse, and clear chips.

Hole quality and accuracy

Two‑cutter bits can sometimes produce slightly more ovality than four‑cutter heads, particularly in rough aggregate. With this bit, hole roundness was well within what I expect for 5/8-inch mechanical anchors and epoxy systems that allow standard tolerances. The walls were consistent and free of glazing, which helps bonding for adhesives—as long as you’re diligent with brushing and vacuuming. If you routinely drill through rebar or need ultra-clean geometry for premium adhesive specs, a four‑cutter or rebar-cutting bit still has an edge. For general anchor applications, this bit produced reliable holes that gauged correctly with my calipers and sleeves.

Debris evacuation and dust control

The U-shaped flutes and open-head design work together noticeably well. In deeper holes, I could feel the bit continue to pull dust without the telltale crunching that signals packed chips. That reduces heat and extends carbide life. Overhead, I paired it with a shroud and vacuum; even without one, the flutes kept debris moving rather than letting it settle back onto the tip. You still need to do the proper blow-brush-blow routine for adhesives, but the bit helps you get there faster.

Durability and wear

Durability is where the hardened core shows its value. I didn’t baby the bit. It hit a few tough aggregate pockets and one light brush with mesh reinforcement, and the carbide edges held up without chipping. After dozens of holes, the cutting lips showed the expected polishing but no rounding that would slow the cut dramatically. I didn’t detect a shift in diameter, and the shank shoulders remained crisp. It’s not a rebar-cutter—if you know you’re going to intersect steel, use the right bit—but in typical concrete, it’s built to last.

Heat management is solid. With proper evacuation, the bit never ran so hot that it discolored, even on back-to-back holes. That’s not only better for the carbide, it also keeps the braze joints intact over the long haul.

Control and vibration

Longer bits can whip when you’re off-axis or when they hesitate in dense aggregate. This one stayed surprisingly composed. It’s still on the user to start square and let the hammer do the work, but I felt less vibration through the handle than I expected for a 16-inch length. On my older spline hammer, that’s a welcome relief; combined with the bit’s clear chip flow, it made repetitive drilling less fatiguing. During overhead work, the bit resisted walking, which reduces the time you spend stabilizing above shoulder height.

Practical tips from the field

  • Mark and divot your start point; the tip will grab quickly and stay straight.
  • Don’t outrun your vacuum. The flutes are capable, but a dust extractor maximizes speed and keeps the hole clean for anchors.
  • Pulse the feed pressure. Let the hammer breathe; you’ll feel the bit re-engage as chips clear.
  • If you suspect hitting steel, stop and switch to a rebar-rated cutter. Protect the carbide and the hammer.

Value and positioning

If you’re running a spline‑shank platform, your options are narrower than the SDS‑world. This DeWalt bit hits a dependable middle ground: robust build, fast chip evacuation, and predictable hole quality without the premium pricing of specialty multi-cutter heads. It’s a single piece and a single size, so you’re not paying for modularity you may not need. For crews keeping a spline hammer in the kit for heavy demolition and anchor work, this bit makes that platform continue to earn its keep.

Limitations

  • Spline compatibility: make sure your hammer isn’t SDS‑Plus or SDS‑Max. This is niche by today’s standards.
  • Two‑cutter geometry: fast and durable in plain concrete, but not ideal for frequent rebar intersections or the absolute cleanest hole geometry demanded by some adhesive systems.
  • Long length: helpful reach, but, as with any 16-inch bit, you need a steady start to avoid flex or wander.

None of these are dealbreakers; they’re trade-offs you choose based on your work.

Bottom line

I came away impressed with how consistently the DeWalt bit performed across dense slab, CMU, and overhead drilling. The open-head design and U‑flutes aren’t marketing fluff—they translate to real chip control and cooler cutting, which protects the carbide and keeps you moving. The hardened core resists the flex that can plague longer bits, and the hole quality is more than adequate for common anchoring tasks.

Recommendation: I recommend this bit to tradespeople and serious DIYers who run spline‑shank rotary hammers and need a reliable 5/8-inch solution with extra reach. It’s fast in standard concrete, manages dust well, and holds up under a week’s worth of anchor work without drama. If your day-to-day involves drilling through rebar or you require the cleanest possible geometry for high-spec adhesive anchors, consider a four‑cutter or a dedicated rebar-cutting bit. For everyone else operating on a spline platform, this DeWalt is a dependable, long-life choice that emphasizes speed and durability where it counts.



Project Ideas

Business

Masonry Anchor Installation Service

Offer per-hole drilling and anchor setting for contractors (HVAC, electrical, signage, shelving, railings). Specialize in precise 5/8-inch holes in concrete, brick, and block for wedge/drop-in anchors with rapid, dust-managed turnaround.


Signage & Facade Hardware Installs

Provide end-to-end installs of stand-offs, awnings, camera mounts, and conduit clamps on masonry exteriors. The carbide tip and hardened core enable consistent holes in tough aggregate, reducing blowout and rework for a premium finish.


Handrail & Safety Retrofits

Retrofit existing properties with code-compliant anchors for handrails, guardrails, and bollards. Market to property managers and GC punch-list teams, leveraging fast debris clearing from the U-flute for efficient multi-hole runs.


Dust-Managed Drilling for Trades

A mobile, OSHA Table 1–aligned drilling service that pairs dust extraction with this open-head, dust-channeling bit for cleaner holes in occupied spaces. Bundle layout, drilling, and epoxy anchoring for premium, fixed-price packages.


Custom Drilled Masonry Decor

Produce and sell luminary blocks, stone propagation bases, and perforated concrete panels. The long-life carbide tip and spline hammer efficiency enable small-batch production with consistent hole quality and reduced bit downtime.

Creative

Concrete Lantern Blocks

Drill clean, repeating 5/8-inch through-holes in solid concrete pavers or CMU to create perforated ‘lantern’ blocks. Nest battery LEDs inside for dotted light patterns. The carbide tip handles aggregate, while the open-head and U-flute clear dust for fast, consistent holes.


Stone Propagation Stations

Turn river stones or flat beach rocks into plant propagation bases by drilling snug 5/8-inch sockets for 16 mm glass tubes. The hardened core reduces bit wander and breakage in tough stone, producing straight, repeatable seats for the tubes.


Dowel-Joined Stone Furniture

Create small stone-topped side tables or benches by drilling matching 5/8-inch holes in the stone slab and in wood/metal legs, then epoxying steel dowels. The spline-shank hammer action and carbide tip power through masonry cleanly for tight, aligned joints.


Garden Water Feature Rocks

Bore 5/8-inch channels through selected rocks to route fountain tubing for a recirculating water feature. The U-shaped flute evacuates slurry efficiently, helping maintain a straight path for the tubing and reducing clogging.


Brick Trellis + Art Mounts

Install robust anchors into brick or concrete block to mount a cable trellis or heavy wall art. This bit produces accurate holes for heavy-duty sleeve/wedge anchors, and its open-head design channels dust into the flutes for cleaner work on vertical surfaces.