Replacement 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" quick change shank reduces slipping in standard chucks and is compatible with impact drivers. Set includes 1 each: #6 Model No. 1882787 (SKU 301654), #8 Model No. 1882788 (SKU 301659), #10 Model No. 1882789(SKU 301661), and 1 stop collar.