Snappy Brand Quick-Change 5-Pc. Countersink Drill Bit Set. Proudly Made in the USA. In one step, you can drill, countersink and counter bore the perfect sized hole for #4, #6, #8, #10, or #12 screws. Snappy Tools Countersinks will drill the pilot hole and countersink or counter-bore for screws in one step. Countersink to drive the head of the screw flush with or slightly below the surface Ideal for plugs or dowel buttons. The 1/4" hex shank can be used with power drills and quick-change chucks. Experience the higher quality of Snappy Tools. Combining higher quality materials and patented technology, Snappy delivers industrial quality tools to the tradesman and do-it-yourself markets at an affordable price.