DeWalt OSC General Purpose Assortment (3 Pc)

Why I reached for this 3-piece set

Oscillating tools live or die by their blades. On a recent punch list of drywall patches, a couple of nail-filled demo cuts, and some quick plumbing access work, I ran this DeWalt 3-piece oscillating blade set through the kind of mixed tasks most of us see in real life. The assortment is simple—one plunge-style blade with a reinforced tip, a wider three-sided blade for aggressive drywall and fast wood cuts, and a general-purpose bi-metal blade. It’s not a kitchen sink kit, but it covers the bulk of everyday cuts without forcing you to overthink blade selection.

Design and build quality

The set’s standout is the plunge blade with a hardened, coated tip. The coating isn’t cosmetics—it helps shed heat and friction and takes the brunt when you kiss a hidden fastener. The three-sided “box” blade is 2-1/8 inches wide, which lines up nicely for single-gang cutouts. Tooth geometry across the set leans bi-metal and multi-material, so you’re not swapping blades every time you encounter a nail or a bit of copper.

These aren’t the thinnest blades I’ve used, but they feel rigid in a way that helps accuracy, especially when you’re freehanding a plunge. The trade-off is a bit more effort in very dense hardwoods, but for framing lumber, drywall, and plastics, the stiffness is an advantage.

Setup and compatibility

I ran the set on a DeWalt cordless oscillating tool with the standard OIS interface, and everything seated firmly with no slop. I also tested fitment on an older bolt-clamp Fein MultiMaster—the blades clamped securely and ran true. If you’re on a Starlock-only platform, plan on an adapter or choose Starlock-specific blades; these aren’t Starlock. On most OIS-compatible tools from DeWalt, Makita, Milwaukee, and similar, you should be fine.

Drywall: fast, clean, and predictable

The three-sided blade is clearly optimized for drywall. I traced a remodel box, scored the paper with a utility knife, and plunged on full oscillation speed. The entry is controlled—no skittering—and the blade tracks corners cleanly. The width is a near-perfect match for single-gang boxes, and the geometry clears dust quickly so you can actually see your line.

For larger cutouts, the same blade lets you rip along studs without binding. If I had to nitpick, the aggressive tooth pattern can fuzz the paper edges a touch compared to a finer-tooth specialty drywall blade, but the speed gain is worth it for most jobs. A light sand cleans the edges up.

Wood and nail-embedded cuts

In 2x SPF with the occasional 8d nail, the coated plunge blade earns its keep. Plunges are crisp—set the nose, roll your wrist, and the blade carries itself straight without wanting to wander off-line. I intentionally ran into a few fasteners to see how the edge held up. The blade slowed but kept cutting cleanly through the wood after; tooth loss was minimal, and I didn’t see the dreaded blueing you get when heat builds up. If you’re removing trim or cutting out a section of baseboard over a hidden brad, you’ll appreciate the added resilience.

For longer rips in plywood or subfloor, I preferred the wider three-sided blade. It’s steadier over distance and clears chips better, but it won’t get you into tight corners. I used the general-purpose blade as a backup for finish work in poplar; it leaves a slightly smoother edge than the wider blade, though it’s slower on long rips.

Metals and plastics

This is where expectations matter. The general-purpose blade and the plunge blade will handle light-gauge ferrous metal, copper, and aluminum at moderate speeds. I cut off a few protruding drywall screws and notched 1/2-inch copper pipe for a vanity install. Keep your speed down, don’t force the cut, and the blades stay cool and last. In thicker or hardened steel, they’ll do it, but they’re not fast—and this is a place where a dedicated carbide blade is still king.

PVC is easy. Both the plunge blade and the wider blade chew through 1-1/2-inch and smaller pipe without melting, especially if you bump your speed down one notch. Cuts are square and predictable.

Precision and control

DeWalt’s plunge tip is the right shape for accurate entries. I like to rest the nose, pull the tool toward me until the teeth bite, and then roll into the cut—this blade rewards that technique. There’s enough stiffness that the blade doesn’t flex into adjacent surfaces, which helps when you’re flush-cutting to a floor or casing. I did notice slightly more vibration on the wide drywall blade at full speed, but it’s manageable with a steady grip.

Durability and heat management

Over a weekend of mixed use, the plunge blade took the most abuse—nail hits, dense knots, and a few overzealous plunges into studs. The coating on the tip seems to make a practical difference: less heat buildup, fewer scorched edges. After all that, teeth were worn but intact, and the blade still tracked straight. The general-purpose blade dulled faster when I asked it to do too much metal, which isn’t surprising. If metal cuts are a big part of your workload, consider supplementing this set with a carbide tooth option.

I didn’t experience any tooth shedding or warping. Edge life is competitive with other bi-metal options I’ve used, and better than bargain-bin generics.

What could be better

• No tile or masonry capability. This set isn’t for grout or cement board. Plan on a diamond or carbide grit blade if that’s in your scope.
• Limited metal aggression. For stainless or thicker steel, you’ll want a dedicated carbide metal blade.
• Three blades, no case. It’s a straightforward assortment without extras; organization is on you.
• The wide blade doesn’t fit into tight spaces. Not a flaw, just the nature of a 2-1/8-inch profile—keep the plunge blade handy for corners.

Practical tips from the field

• For electrical box cutouts, trace the box or use a template, then run the three-sided blade just inside the line. Clean up edges with a quick pass of the plunge blade if needed.
• On nail-embedded wood, use the coated plunge blade at a medium speed and let the oscillation do the work. Forcing the cut shortens blade life.
• For metals, drop your speed and use a light, forward-peeling motion. Pause occasionally to let the blade cool.
• Keep a shop vac nozzle nearby. These blades clear dust well, but visibility is always better with suction.

Who this set is for

If you use an oscillating tool for remodeling and repair—drywall cutouts, trim adjustments, occasional demo where fasteners lurk—this DeWalt set hits a sweet spot. It’s versatile without being fussy, and it holds up under the sort of “oops, there’s a nail” surprises that eat cheaper blades. If your work leans heavily into metal or masonry, you’ll want to add specialty blades to your kit.

Compatibility-wise, it’s a good match for most OIS-style tools. Starlock-only users should check for adapters before committing.

The bottom line

I like this DeWalt 3-piece set because it does the everyday jobs well and survives the unexpected ones. The plunge blade’s durability and control stand out, the 2-1/8-inch blade streamlines drywall work, and the general-purpose blade fills the gaps. Edge life is solid for bi-metal, heat management is better than average thanks to the coated tip, and cut quality is predictable across common materials.

Recommendation: I recommend this set as a reliable, grab-and-go assortment for general remodeling and maintenance. It’s not the most specialized kit, and it won’t replace carbide for heavy metal or diamond for tile, but as a core trio for wood, drywall, plastics, and light metals, it’s a smart, durable choice that earns a spot in the bag.