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 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 Included: 2pcs Countersunk drill bit 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.