7-piece Taper Drill & Counter Sink Set Bits are designed to follow the taper of screws to give you a good tight fit. Includes 7 tapered drill bits with matching countersinks and adjustable depth stop collars. Hex shanks to prevent slipping For screw sizes #5, 6, 7, 8, 9, 10 and 12. Drill sizes: 1/8", 9/64", 5/32", 11/64", 3/16", 13/64" and 7/32".