Drill, countersink, and counterbore holes in one step Use for plugs and dowels 1/4" hex shank can be used with quick change chucks Depth stop has free rotating ring with chome ball bearings prevents damage to workpiece Large, radiused cavity reduces chip packing 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. The unique mounting channel and clamping nut on the depth stop will allow you to precisely set your desired depth of cut. Once set you'll be able to repeat the same depth of cut time and time again.