- Quality guaranteed. This set uses high-speed steel (HSS) for durable, reliable performance in woodworking. - HSS tapered drill bits with countersinks. Conical countersink kit with pin-fixed drill bits and torque countersink bits, designed to improve chip flow. 1/4 in shank for the drill bits; includes a countersink for wood. - Adjustable countersunk bit with built-in depth stop. Depth is controlled by screws that attach the adjustable counterbore to the shank plane, enabling precise hole depth. This is an adjustable countersink drill bit set suited for woodworking. - Five sizes of tapered drills with countersinks. 7/64 in, 9/64 in, 11/64 in, 3/16 in, and 7/32 in. Includes a 1-1/4 in hex shank for the countersunk bit. - Applications and compatibility. Suitable for hardwood and softwood, delivering smooth counterbores and screw taper holes for flush mounting. - Practical use scenarios. Ideal for cabinet and furniture assembly to create flush screw holes; mounting hardware such as hinges and handles with clean countersinks; decorative woodwork requiring precise, repeatable countersink depths.