2pcs Hex Countersink Drill Bit End Mills Cutter Chamfering 7 Flute 82 Degree for Wood Metal Plastic Reamer Cutting edge is sharp and smooth,high working efficiency. Seven pieces of cutting edgehe chamfered face is neater and smoother, It is used for chamfering and drilling on wood board or thin plastic board, but metal is not allowed It is suitable for electric drill,bench drill and other drills.