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Irwin Speedbor 188279 Series 8-Piece Countersink Drill Bit Set, 1/4" Quick-Change Shank
The Irwin Speedbor 188279 Series 8-Piece Countersink Drill Bit Set is built for fast, clean pilot holes and secure countersinking in wood, giving woodworkers and builders a complete kit for screw installation in one case. Each bit combines a tapered drill with widened flutes for quick, clean drilling with an adjustable four-cutter counterbore attachment that cuts and clears chips fast for smooth countersinking results. The counterbore attaches to flats on the shank with two hex screws for a secure fit and can be adjusted to control pilot hole depth for a range of screw lengths. Every bit in this 8-piece set features a 1/4" quick-change shank that fits all standard 1/4" quick-change chucks, including impact drills, so bits swap in and out quickly on the jobsite or in the shop.
Key Features
- 8-Piece Set: Includes eight Speedbor countersink drill bits in one set, giving you options for common wood screw sizes without buying bits individually.
- Adjustable Four-Cutter Counterbore: The four-cutter counterbore attachment cuts fast and clears chips quickly for smooth, efficient countersinking applications.
- Tapered Drill With Widened Flutes: Drills fast, clean pilot holes and ensures a tight fit for screws, reducing wood splitting around the screw head.
- Secure Two-Hex-Screw Attachment: The counterbore attaches to flats on the shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth.
- 1/4" Quick-Change Shank: Fits all standard 1/4" quick-change chucks, including impact drills, for fast bit changes and reduced slipping in the chuck.
- Non-Energy Using Accessory: No battery included or required; the bits are designed to be used with your existing drill or impact driver.
Technical Specifications
- Warranty: NLW
- Claims Needed: No
- Individual Vs. Set (Syndigo): SET
- Country of Origin: China
- Battery Included: No
Typical Applications
- Countersinking and Pilot-Hole Drilling in Wood
- Furniture Assembly and Cabinetry
- Deck, Fence, and Trim Carpentry
- Use With Standard Drills and Impact Drivers
- DIY and Professional Woodworking Projects
Why Irwin?
Irwin Speedbor countersink bits pair a tapered drill and widened flutes with an adjustable four-cutter counterbore so every hole is clean and every screw sits flush. The two-hex-screw attachment keeps the counterbore locked securely to the shank while still allowing precise depth adjustment for different screw lengths, and the 1/4" quick-change shank works with the standard chucks and impact drills already in your toolbox. This 8-piece Speedbor 188279 Series set gives woodworkers, cabinet builders, and DIYers a dependable, ready-to-use countersinking solution from Irwin, with every bit designed to swap quickly into standard 1/4" quick-change chucks and impact drills already on the jobsite. From framing trim to cabinetry and deck building, this set keeps pilot-hole drilling and countersinking consistent from the first bit to the last.
Manufacturer Resources
Product Specs
- Warranty:
- NLW
- Claims Needed:
- No
- Individual Vs. Set (Syndigo):
- SET
- Country of Origin:
- China
- Battery Included:
- No
- Power Source:
- NON-ENERGY USING
- list_batch:
- IRW-20260923
- Product Type:
- Drill Bit Set
- Series:
- Speedbor
- Configuration:
- 8-Piece Set
- Department:
- Electrical
- Product Subgroup:
- Hole Saws & Bits
- Product Size:
- 1/4"