Features: -[Wide Application]: Suitable for workpieces with hardness less than 65HRC, such as stainless steel, aluminum plate, carbon steel, thin iron plate, insulation board, PVC board, wooden board etc. -[Performance ]: has a partial design, which makes the chips generated during the chamfering process more convenient and does not hinder work efficiency due to tool blockage. -[Grinding Function]: The blade can be ground, and a more convenient maintenance method allows you to grind the tool without unloading. -[Ease of Use]: The automatic through-hole chamfer cutter can quickly trim and chamfer both sides of a hole in seconds. -[High speed steel]: excellent material, capable of cutting various hard metals and improved blades double the tool life. Specifications: Product Name: Countersunk Head Drill Bit Type: 3 Flute 90 Degree Size: 6.3/8.3/10.4/12.4/16.5/20.5mm Length: 44-64mm Color: Silver Material: HSS Quantity: 2PCS Package includes: 2pcs Drill Bits countersunk head Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.