Features: Brand new and high quality Three Flute 90 degree chamfering cutter, high concentricity of chamfering, no burr. The product are made from HSS, durable, sharpness and wear-resistant. Suitable for milling cutter, drilling machine, chamfering machine and other machine tools Processing die steel, rail, chamfering, etc. Great for sinking 90 Degree holes into wood and soft metals countersunk screws and fixings. Suitable for DIY and general building/engineering using Specifications: Material:High Speed Steels Total length (mm): 45-49-50-56-61-65 Edges diameter (mm): 6.3-8.3-10.4-12.4-16.5-20.5. Handle diameter (mm): 5-6-6-8-10-10 Package Includes: 6Pcs Countersink Drill Bit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.