1、BENDING RESISTANT AND WEAR RESISTANT: The hole sink drill is made of excellent alloy steel through accurate machining of high accuracy equipment, bring good chip removal effect, strong bending resistance, wear resistance, and durable 2、DURABLE MATERIAL: The structure design of the drill bit is reasonable, the chamfer is made of No.45 steel, beautiful and durable, with excellent quality and detail 3、FAST AND EFFICIENT: A spiral groove with a central bit will quickly drain debris from the hole, which can effectively prevent the accumulation of debris retention and improve drilling efficiency 4、APPLICABLE SCENARIO: Countersink drill bit can be used in wood, plastic, soft metal, fiberboard, aluminum alloy screw countersink hole, hole opening, etc. 5、WITH FITTINGS: Countersink drill bit kit contains wrenches, hex wrenches, set screws and storage boxes, convenient for your use and storage