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Features: 1. Drill and countersink for wood screws without changing bits. 2. Special designed steel counter sleeve countersinks or counter bores pilot hole. 3. Adjustable counter sleeve depth with the chamfer. Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew. 4. The chamfer has 5 flutes, it can discharge the wood more rapid when drilling, sink hole disposable drilled smooth, screw cap perfect embedded in the surface of workpiece. Note: It is recommended to use the center punch for position before drilling, keep the drill bit vertical to avoid the drill bit from bending or breaking. Purpose: Use on steel,aluminum&other metals,plastic or wood.Drilling length can be adjusted for different situations simply by loosening and tightening the setscrew. Versatile: Three sharp positioning,not easy to slip,carbon steel material,high strength,good toughness. How to use woodworking countersink drill bit? 1. Attach to power bench or hand drill driver. 2. When woodworking or building molding zoom in and chamfer the edge of the drilled hole. 3. Then a screw,nail,or bolt can be inserted flush with the surface you are working on. Package: 4 x Woodworking chamfer + 1 x Hex Shank Parameter: 3mm x 60mm(L) 4mm x 75mm(L) 5mm x 85mm(L) 6mm x 93mm(L) Dia of Chamfer: 15.8mm Shank: 1/4 hex shank.