Features: The same cobalt containing high-speed steel material, with a TiAIN coating on its surface-, can extend its service life three times. TiAIN coating is resistant to ultra-high temperatures and can be used for a long-time without coolant, making it suitable for dry high-speed cutting. Industrial grade TiALN coating, where Al2O3 forms on the surface-, forming a hard protective layer during drilling. (Suitable for high-speed drilling) The surface- hardness of the HSS-CO high-speed steel TiAIN coating after heat treatment- is as high as 89 degrees. Carbon steel, 304 stainless steel, etc. - Industrial grade TiAIN coating (over 4241 and 6542 high-speed steel materials, longer lifespan!. Higher accuracy, achieving drilling burrs；Internal chip removal: eliminate metal chip splashing phenomenon. Specifications: Material: HSS-Co/M35 Coating: TiAlN Coating Hardness: HRC89 Size: 1-4/2-5mm/5-10mm/10-15mm Handle size: 1/4 "Hexagonal Handle Chamfer: 90 ° Usage: High-speed steel cobalt/M35 TiAIN coating Inner Hole Types：1-4mm/ 5-10mm/ 2-5mm/ 10-15mm/ 15-20mm Package Includes: 1PC Deburring Chamfering Tool note: Due to the different monitor- and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Please allow 1-2cm measuring deviation- due to manual measurement.