Snappy Quick-Change 5-Pc. Countersink Drill Bit Set
In one step, you can drill, countersink and counterbore the perfect sized hole for #4, #6, #8, #10, or #12 screws. Counterbores are 3/8" or 1/2" diameter. Ideal for plugs or dowel buttons. The 1/4" hex shank can be used with power drills and quick change chucks.