
Steel countersink or counterbore hole. Countersink depth adjustable with Allen key Standard hex shank is quick-change compatible Drill and countersink for wood screws without changing bits< /p> Drilling length can be adjusted for screws of different lengths by simply loosening and tightening the set screw Four-piece set includes bits for drilling holes for screw sizes #5, #6,#8,#10. and #12