Multi-Size Drill Bits Hex Shank Countersink Drill Bit Set, 1/4? Hex Shank? ?Wide Application Range?These countersink drill bits are suitable for use with natural woods,chipboard,man-made boards,plywood,MDF,aluminum, non-ferrous metals and decking. ?Unique Design?The pilot drill and counterbore depths are adjustable using a frictionless depth stop and included wrench,the drill bits with spiral chip flute ensure fast cutting,while the sharp tungsten steel alloy cutting edges create smooth countersink and counterbore holes. ?Material?Countersink drill bit set made of high-quality material,durable and efficient. ?Variety of Options?M2 HSS pilot drill bits in sizes #10, #12, and #14 (equivalent to 1/8",9/64" and 5/32" drills). ?Cool Gifts?It is the best friend gift or for your loved person on holidays,valentines day gifts anniversary gifts for men,birthday gifts for dad,boyfriend,women.