Irwin Industrial Tool Co 1882630 Countersink Wood Drill Bit

Product Description

The IRWIN INDUSTRIAL TOOL CO 1882630 is a No. 4 countersink wood drill bit designed for driving wood screws cleanly and accurately into dimensional lumber, sheet goods, and trim materials. The tapered drill body features widened flutes that clear chips quickly, producing fast, clean pilot holes that ensure a tight screw fit. An adjustable four-cutter counterbore is secured to the shank flats with two hex screws, allowing the installer to set a controlled pilot hole depth and achieve smooth, consistent countersinking in a single pass. The 1/4 inch quick-change shank reduces slipping in standard drill chucks and is compatible with all 1/4 inch quick-change chuck systems, including impact drivers.

This bit is suited for residential and light commercial woodworking, cabinetry, decking, and finish carpentry applications where clean pilot holes and flush or recessed screw heads are required. The adjustable counterbore makes it practical for production runs where consistent screw depth is critical. Carpenters, finish contractors, and millwork installers will find the quick-change shank especially useful when switching frequently between drilling and driving operations. The package contains 6 units, making it a practical stock item for a working tool kit or van supply.

Key Features

• Tapered drill with widened flutes for fast chip clearing and clean pilot holes
• Adjustable four-cutter counterbore allows controlled pilot hole depth settings
• Counterbore secured to shank flats with two hex screws for a stable, non-slip fit
• 1/4 inch quick-change shank compatible with standard and quick-change chucks, including impact drills
• Sized for No. 4 wood screws
• Sold in a package of 6 bits

Compatibility

Compatible with all 1/4 inch quick-change chuck systems, including impact drills. Designed as a No. 4 tapered countersink bit for use with No. 4 wood screws in standard woodworking and carpentry applications.

Installation Notes

Installation is performed by carpenters and general contractors using a standard drill driver or impact driver equipped with a 1/4 inch quick-change chuck. Before adjusting the counterbore depth collar or tightening the hex screws, ensure the drill is unpowered and the chuck is disengaged. Use the provided hex screws to lock the counterbore at the desired depth before beginning a production run, and verify the setting on scrap material first. Follow applicable safety practices for rotating cutting tools per manufacturer guidance and applicable worksite codes.