Irwin 1877791 Countersink Set Black Oxide Hss 5 Piece

Product Description

The IRWIN INDUSTRIAL TOOL CO 1877791 is a 5-piece countersink set designed for drilling countersunk pilot holes in wood, composite, and similar materials. Each bit in the set features a high-speed steel (HSS) construction with a black oxide coating that reduces friction and extends tool life. The assorted sizing across the five pieces makes this set suitable for a range of fastener diameters and countersink depths. It is a practical addition to a working tool kit for carpenters, finish installers, millwork contractors, and general tradespeople who need clean countersunk holes on the job.

This countersink set is used in residential and light commercial construction and finish work, including cabinet installation, door hardware, decking, and trim work. The assorted configurations allow a single set to cover the most common wood screw sizes encountered in typical installation tasks. Tradespeople who regularly drive flush or recessed fasteners will find the variety of sizes useful across multiple applications on a single job site.

Key Features

• 5-piece assorted countersink set covers a range of common fastener sizes
• High-speed steel (HSS) construction for durability and cutting performance
• Black oxide coating reduces friction and provides corrosion resistance
• Suitable for wood, composite, and similar soft materials
• Compact set format for easy storage and transport in a tool bag or case

Compatibility

Designed as a general-purpose countersink set compatible with standard drill chucks for use in cordless or corded drills commonly used in finish carpentry and construction trades.

Installation Notes

Countersink bits are installed and removed by a licensed or qualified tradesperson using a standard keyed or keyless chuck. Always ensure the drill is powered off and the chuck is fully tightened before operation. Use appropriate speed settings for the material being drilled to avoid overheating the bit or tearing out the workpiece surface.