Irwin Multi Size Dia. Steel Wood Countersink 1/4 in. Round Shank 8 pc.

IRWIN Wood Countersinks feature a tapered drill and wide flutes that drill fast clean pilot holes and ensure a tight fit for screws. They have an adjustable four cutter counter bore attachment that cuts fast and clears chips quickly for fast smooth countersinking applications. The counter bore feature attaches flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth. IRWIN SPEEDBOR countersink bits fit all standard 1 4 quick change chucks including impact drills.