Irwin 1877793 Countersink Drill Bit, HSS, Black Oxide

Precision ground 82 deg tip for countersinking most machinable metals, wood or plastic. High-speed steel with black oxide coating for corrosion resistance. 5-flute design reduces chatter for smoother drilling and extended life. Set includes one 1/4 in, one 3/8 in, one 1/2 in, one 5/8 in and one 3/4 in countersink.

• Made from industrial-grade high-speed steel for increased durability
• Made from industrial-grade high-speed steel for increased durability
• Black oxide finish for added corrosion resistance
• Five flute design reduces vibration for smoother drilling and extended life
• 1/4 in round shank fits all handheld and stationary drills
• Precision ground 82 deg tip for countersinking most machinable metals, wood or plastic