1. The drill bit is made of high-speed steel, with high hardness, impact resistance, heat resistance, wear resistance, durability and long service life.2. The flat design of the shank is convenient for clamping and effectively solves the slippage of the center drill during use.3. After special heat treatment, the drill has high precision, smooth cutting and high strength. With the hole saw, it is suitable for drilling holes on tables, household wood, aluminum plates, alloy plates, etc.4. The drill is used with the hole saw. Set the center of the circle on the material and drill the center hole. After the edge of the hole saw is in contact with the material, continue to drill down to make the required circular hole in the material.5.