IRWIN Speedbor Countersink Wood Drill Bit, Number-8 Replacement Bit

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. Features Adjustable four-cutter counterbore cuts and clears chips quicker for fast, smooth countersinking. Counterbore attaches to flats on shank with two hex screws for a secure fit, and can be adjusted for controlled pilot hole depth. 1/4" quick-change shank reduces slipping in standard chucks and is compatible with all 1/4" quick-change chucks, including impact drills. Tapered drill with widened flutes for drilling fast, clean pilot holes. Specifications Width: 1.850 in Country of Origin: China Height: 7.210 in Length: 0.375 in Weight: 0.055 lbs Bit Type: Countersink Product Type: COUNTER SINK DRILL BIT Warranty: NLW