【HIGH QUALITY MATERIAL】: High speed steel drill bit with brass body; High hardness, rust resistance, strength, durability and superior drilling performance that serve as a guide to center the pilot holes required for hinges. 【ACCURATE POSITIONING】: The pilot hole drill bits are precisely positioned and are not offset. The drill guide can be well fixed to ensure punching accuracy. The sawdust automatically flows into the holes on both sides of the drill bit without jamming the drill bit. This increases the safety of using the product. 【EASY USE AND INSTALLATION】: Different hardness wood requires different centering drill bit, you just need to disassemble the screw and replace the drill bit with a new one. Perfect carpenter tool for woodworking, mounting hinges on wooden doors, cabinets, windows, etc. 【EXCELLENT DESIGN】: The sawdust will be automatically discharged from both sides of the holes, without the drill getting stuck, you will not have to remove the wood chips, effectively