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

Adjustable 4-cutter counterbore cuts and clears chips quicker for fast, smooth countersink or counterbore drilling

Attaches and adjusts with 2 hex screws

Counterbore attaches to flat on shank for a more secure fit

Adjustable stop collar attaches to counterbore for controlling countersink depth

1/4" hex quick change shank reduces slipping in standard chucks and is compatible with impact drivers