Packing: 1pcs Material:copper+high speed steel drill Shank:1/4 hexagonal shank, the drill is 5mm, the diameter of the open hole is about 5mm Strong, wear-resistant, anti-rust, corrosion-resistant, durable, long service life With unique design, perfect punching effect. Sawdust will be automatically discharged from the top of the holes on both sides Precise positioning, will not be shifted, wood chips will be automatically discharged from the holes on both sides of the drill bit, will not jam the drill bit Ideal for installing locks, knobs on doors and cabinets or for drilling larger diameter holes in tables, etc. Widely used on wood and plastic