The three-tooth design of the knife head has high sharpness, low cutting resistance and improved opening efficiency. The sharp center spur accurately locates the center of your hole. With an optimised geometry specially designed for cutting, the performance of the chisel is significantly improved. Specification: Surface: titanium coated material: high-speed steel Package includes: 1 piece HSS drills. Attention: To prevent the product from rusting and make better use of the product, our twist drill bits are lubricated on the surface, which is normal and no dirt. Please rest assured that you are buying. If you have any questions, please feel free to contact us. We will reply to you within TIPS: Can not be used for cutting metal holes. Before drilling, make sure there are no nails or other metal objects in the wood to avoid damage to the Forstner bits.