6 Pcs Cobalt Steel Single-End Countersink Chamfer Tool Deburring Tool Set Round Shank for Cutting Holes in Plastic Copper Aluminum Plate Insulation Boards PVC Sheet

Countersink drill bit is made of cobalt steel material, high hardness, rustproof, and durable; The countersink set chamfering with a groove, easier to discharge debris and the High Carbon Steel Drill Bit not easy to blunt; High hardness, smooth chip processing, can fulfill the chamfering, deburring, and cone processing. for workpiece circular aperture chamfering or cone hole; countersink bit for metal with various sizes: 6.3mm, 8.3mm, 10.4mm, 12.4mm, 16.5mm, 20.5mm countersink for steel. cobalt countersink is idea for cutting through, aluminum, copper, stainless steel, aluminum plate, insulation boards, and PVC sheet,.;