Features 1、With high hardness and high temperature resistant nitride coating the surface, cutting blades are sharp. High speed, with super wear resistance and long service life 2、Forging repeatedly with air hammer, to improve its hardness and wear resistance. Under high speed it will show super fatigue fracture resistance of high speed steel 3、To prolong its service life, keep it warm in high temperature and high concentration of nitrogen for four hours to process deep nitrogen treatment on the surface, make it have strong cutting performance 4、Using machine tools to process coarse and fine grinding repeatedly on blade surface, as to achieve the high standard of surface finish 5、Mainly used for processing or cutting off on copper, iron, aluminum, alloy and other medium hard narrow and deep slot metal material. Can also be used for milling process on non-metallic materials such as plastic, wood Specification Description: These cutting blades are made from strong high speed steel for durability, high hardness, fast and precision cutting. They offer extra long service life and ensure straight, accurate cutting. When cutting stainless steel material, high speed steel with high nitrogen or coating blade milling cutter should be used. With high hardness and high temperature resistant nitride coating the surface, these cutting blades are quite sharp and mainly used for processing or cutting off on copper, iron, aluminum, alloy and other medium hard narrow and deep slot metal material . They can also be used for milling process on non-metallic materials such as plastic, wood. Features: With high hardness and high temperature resistant nitride coating the surface, cutting blades are sharp. High speed, with super wear resistance and long service life. Forging repeatedly with air hammer, to improve its hardness and wear resistance. Under high speed it will show super fatigue fracture resistance of high speed steel. To prolong its service life, keep it warm in high temperature and high concentration of nitrogen for four hours to process deep nitrogen treatment on the surface, make it have strong cutting performance. Using machine tools to process coarse and fine grinding repeatedly on blade surface, as to achieve the high standard of surface finish. Mainly used for processing or cutting off on copper, iron, aluminum, alloy and other medium hard narrow and deep slot metal material. Can also be used for milling process on non-metallic materials such as plastic, wood. Specifications: Materiel: HSS Inner Diameter: 6.35mm Outer Diameter: 22mm, 25mm, 32mm, 35mm, 44mm, 50mm Thickness: 0.7mm(of 22mm, 25mm, 32mm) 0.8mm(of 35mm, 44mm, 50mm) Maximum Speed: 20000rmp Extension Rod Size: 3 x 50mm / 0.11 x 1.96" Weight: 42g(approx.) Package Includes: 1 Set x Cutting Blades(22mm&25mm&32mm&35mm&44mm&50mm ) 1 x Extension Rod Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List