High Carbon Steel Material. High hardness, offer superior cutting power and durable. Quickly and accurately drill a smooth hole.Better in CENTERING and NO SKID. chamfer design will fast discharge chips from the hole on both sides automatically. Easy to use the combination of Hex Key to adjust or disassemble the countersink drill bit and the five-flutes chamfering. Suitable for bench drill, hand drill and conventional electric drill. Perfect for wood, fiberboard, particleboard, plywood, plastic, PVC.