In one step, this 2-in-1 bit allows you to drill a pilot hole and countersink the perfect sized hole for #6, #8, #10 or #12 screws. This allows for your screw to be flush or below the material you are fastening in to. The HART Countersink Bit Set has a titanium coating to reduce friction and provide longer bit life. The ¼-inch hex shank provides stronger holding power for the chuck of a drill and easy depth adjustment with included hex key. Set includes #6, #8, #10, #12 and a hex key. HART 5-Piece Assorted Titanium Countersink Bit Set: ------------ Key Features ------------ * Adjustable depth with hex key * 2-in-1 bit for pilot hole and countersink * Titanium coated bits for reduced friction and longer life of the bit * For drilling into wood * Designed for use in drill/driver * 1/4-Inch hex shank * Includes: (1) #6, (1) #8, (1) #10, (1) #12, (1) Hex Key * Specs: Size: Assorted Application Material: Wood Adjustable Depth: Yes Shank Size: 1/4" Hex