Feature:1. BENDING RESISTANCE AND WEAR RESISTANCE: The hole sink is made of excellent alloy steel through accurate machining of high accuracy equipment, bring good chip removal effect, strong bending resistance, wear resistance, and durable2. DURABLE MATERIAL: The structure design of the sink is reasonable, the chamfer is made of No.45 steel, beautiful and durable, with excellent quality and detail3. 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 efficiency4. WIDE USE: Countersink drill bit can be used in wood, plastic, soft metal, fiberboard, aluminum alloy screw countersink hole, hole opening, etc.5. WITH FITTINGS: This set contains wrenches, hex wrenches, set screws and storage boxes, convenient for your use and storageSpecification:Item Type: Countersink Drill BitMaterial: Alloy steelColor: SilverSize: Approx. 3 x 10mm / 0.12 x 0.39inApplication: Used for wood, plastic, soft metal, fiberboard, aluminum alloy screw countersink hole, hole opening, etc..Package List:1 x Limit Countersink Drill Bit1 x Wrench1 x Hex Wrench1 x Set Screw1 x Storage Box