In one step you can drill, countersink, and counterbore the perfect sized hole for #6, #8, #10, and #12 screws. Countersink to drive the head of the screw flush with or slightly below the surface. The drill bits are adjustable for different length screws.
Hex Shank Size: 1/4"
Includes: 2.5mm Allen wrench
Weight: 0.15 lbs
https://www.youtube.com/watch?v=YxE9CtJol3s