Features: Wide application: Suitable for workpieces with hardness less than 65HRC, such as stainless steel, aluminum plate, carbon steel, thin iron plate, insulating plate, PVC plate, wood board, etc. Efficiency: It has a-piece design, which makes the chips generated during the chamfering process more convenient, and will not delay work efficiency due to tool blockage. Grinding function: The blade can be ground, and a more convenient maintenance method allows the tool to be ground without unloading. Ease of use: The automatic through-hole chamfering cutter can quickly trim and chamfer both sides of the hole in a few seconds. High-speed steel: Excellent material, capable of processing various hard metals, and improved blades double the tool life. Specifications: Product Name: Countersunk Drill Type: 3 Flute 90Degree Titanium Plating Size: 6.3/8.3/10.4/12.4/16.5/20.5mm Color: Gold Material: HSS Quantity: 6pcs per set Package Included: 1 × 6.3mm Countersunk Drill 1 × 8.3mm Countersunk Drill 1 × 10.4mm Countersunk Drill 1 × 12.4mm Countersunk Drill 1 × 20.5mm Countersunk Drill