IRWIN 5-Piece Black Oxide Countersink Drill Bit Set – HSS 82 Degree Tip, 1/4 Inch Shank

When you work with countersinks, precision and durability matter. The IRWIN 5-piece Black Oxide Countersink Drill Bit Set is forged from industrial-grade high speed steel, combining rugged performance with a finish designed for workshop environments. The precision-ground 82-degree tip helps start clean countersinks in most machinable metals, as well as wood and plastic. The black oxide coating adds corrosion resistance to keep the bits looking and drilling well after long sessions on the bench. The five-flute design reduces vibration, promoting smoother drilling and longer life, while the 1/4 inch round shank fits a wide range of handheld and stationary drills.

Why choose IRWIN countersinks?

• Precision-ground 82-degree tip enables clean countersinks in metals, wood, or plastic, with reliable start alignment
• Industrial-grade high speed steel delivers durability for repeated use in tough materials
• Black oxide finish offers enhanced corrosion resistance for longer tool life
• Five-flute geometry minimizes chatter and vibration for smoother cuts and extended tool life
• 1/4 inch round shank is compatible with most drills, from portable to bench models

Real-world use scenarios

• Countersinking screw recesses on metal panels, cabinetry hardware, or decorative fittings with a clean, flush result
• Creating pilot holes for wood projects where a flush head is required for a seamless finish
• Using with plastic components to achieve accurate countersinks without murring the surface

Performance and durability you can rely on

The combination of HSS grade steel and a corrosion-resistant finish supports regular workshop use. The five-flute design concentrates cutting edges for efficient material removal while helping to minimize vibration, which translates to a steadier drill feel and longer bit life.

What’s included

• Five countersink bits with 82-degree tips
• Each bit features a 1/4 inch round shank for broad drill compatibility