7 Pieces Woodworking Countersink Drill Bit Set Reamer Carpentry Reamer Core Drill Bit.
Seven piece set includes bits for drilling pilot holes for screw sizes 3mm, 4mm, 5mm, 6mm,7mm,8mm,10mm.
Adjustable counter sleeve depth with wrench. Drill and countersink for wood screws without changing.
Drilling length can be adjusted for various length screws simply by loosening and tightening the set.
Chamfer is 5 flutes,In the process of using, can discharge the wood more rapid, sink hole disposable.