Features
- SDS-plus shank interface
- Straight 3.0 in. extension
- Sold as a 2-piece set
- Screws onto core bit shank
- Designed for use with SpeedCore thin-wall core bits
- Intended for use with smaller hammer drills
Specifications
| Length | 3.0 in. |
| Pack Quantity | 2 pieces |
| Adapter For Machine Side | SDS-plus |
| Core Body Range (With Compatible Bits) | 1 in. to 4-3/8 in. |
| Usable Cutting Depth (For Compatible Bits) | 3 in. |
| Maximum Recommended Rpm For Extension+Bit Beyond 8 In. | 600 RPM |
| Sku | T3922 |
| Gtin13 | 0000346430073 |
| Safety Note | California Proposition 65 warning applies |
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Two straight 3 in. extensions sold as a two-piece set for use with SDS-plus SpeedCore thin-wall core bits. Extensions screw onto the core bit shank to increase reach. Intended for use with smaller hammer drills and thin-wall core bits; observe RPM and length limits when used with extended assemblies.
Model Number: T3922
Project Ideas
Business
On‑Demand Mini‑Core Retrofit Service
Offer a mobile service drilling 1–4‑3/8 in. penetrations for electricians, HVAC techs, and low‑voltage installers (mini‑split line‑sets, EV charger conduit, security/camera cabling). The SDS‑plus thin‑wall system with 3 in. extensions delivers fast, clean holes in tight spaces using smaller hammer drills. Price per penetration, plus sealing and grommet upsells.
Dust‑Compliant Drill & Core Kit Rentals
Rent a turnkey kit: SDS‑plus hammer drill, SpeedCore thin‑wall bits, two 3 in. extensions, vacuum shroud, HEPA extractor, and PPE. Target small contractors and facility teams needing occasional masonry penetrations. Include how‑to cards noting RPM limits beyond 8 in. assembly length and offer consumables for sale.
Masonry Pass‑Through Packages for Home Offices
Productize fixed‑price packages for neat cable and conduit penetrations through brick or block (internet, AV, backup power). Provide coring, sleeving, firestop/sealant, and internal/external escutcheons. The compact SDS‑plus setup reduces set‑up time and building disruption.
Landscape Water & Lighting Coring
Specialize in coring through pavers, retaining walls, and decorative stones to add irrigation emitters, spillways, and low‑voltage lighting. Sell design‑build bundles: coring, tubing/cable routing, and weatherproof terminations, priced per feature.
Small‑Diameter Masonry Sampling & Inspection
Provide quick thin‑wall core sampling for property managers or engineers (efflorescence, moisture intrusion checks, veneer thickness verification). The SDS‑plus extensions allow controlled depth in confined areas, with patching and reporting as add‑on services.
Creative
Hidden TV Cable Pass‑Through in Masonry
Use a thin‑wall core bit with one or both 3 in. extensions to core clean holes through brick or stone fireplace surrounds to route HDMI and power to a wall‑mounted TV. The extra reach lets you pass fully through deep veneer or chimney chases; keep RPM under 600 if your assembled length exceeds 8 in. and use dust collection.
Boulder or Stone-Slab Bubbler Fountain
Drill a centered hole through a landscape boulder or stone slab to run pump tubing for a bubbling water feature. The SDS‑plus extensions add reach so you can core deeper stones without flipping them, producing a tidy channel for the hose while preserving the natural look.
Outdoor Kitchen Utility Pass‑Throughs
Create exact openings for gas lines, electrical conduit, or water lines through brick/block veneers of an outdoor kitchen. Pair thin‑wall core bits with the 3 in. extensions to reach through thicker assemblies and maintain a clean edge for grommets and fire‑rated sealants.
Retaining Wall Lighting and Irrigation
Core small, precise channels through concrete blocks or pavers to run low‑voltage lighting cables and drip lines. The compact SDS‑plus setup works well in tight landscapes where large coring rigs won’t fit.
Concrete Planter Drainage and Feed Tubes
Add controlled drainage holes and hidden fertigation tubes to heavy concrete planters. The two 3 in. extensions let you reach thicker walls and base sections while keeping cuts clean for strainers or grommets.