Never Opened. 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.

Product Details:

Tapered drill with widened flutes for drilling fast, clean pilot holes

Adjustable four-cutter counter bore cuts and clears chips quicker for fast, smooth countersinking

Counter bore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth

1/4 in quick change shank reduces slipping in standard chucks and is compatible with all 1/4 in quick change chucks, including impact drills