Hole Puncher Self Centering Hinge Drill Bit Door Cabinet Hinge Jig Locating Hole Cutter Woodworking Tool high speed Center Drill Bit It's a professional drilling tools set, applicable to the installation of door hinge. Brass and high-speed steel material, durable and excellent for use. Drill bush for precise positioning, will not shift. Sawdust will be automatically discharged from the top of the drill holes on both sides, not stuck drill. special design and perfect punch effect. Applicable to the installation of door hinge. Good tools for carpentry DIY or professional engineers. Please adjust according to hardness of the wood, if the wood is soft, choose a smaller size; if the wood is hard , you can choose a larger size or corresponding opening tool. Color: Silver；Material: Brass + High-speed Steel；Appearance: Electroplating；Type: Core Drill Bit, Manufacturer: Zorlun