Drill the pilot hole and countersink or counterbore for screws in one easy step! The 82 countersink matches the angle on the head of most screws. Precision machined in the USA with tight tolerances. Made of thru-hardened alloy steel providing long cutting life. 1/4" hex power bit shank to fit in impacts and quick change chucks. Easily adjust or replace drill bit by loosening the hardened set screw that ensures a secure hold on the pilot drill. Take advantage of the Snappy quick change chuck that is included with this set for a quick and easy change from drilling to driving. Utilize the Snappy Premium Roatating Depth Stop for precise depth control (Part # 43032) (Sold Seperately)