6Pcs Cleaning Bottom router bit with 8mm Shank, Size : 8*18; 8*20; 8*22 ;8*25; 8*30; 8*32. Solid Hardened Steel Bodies with Anti-Kickback Design, Build-up & Heat Resistant Teflon Coating C3 micro-grain tungsten carbide cutters, double-edged cutting design, excellent concentricity Ideal woodworking tool for cutting all composition materials, plywoods, hardwoods, and softwoods Package Including: 6 x Cleaning Bottom Router Bits Features: C3 Micro-grain Tungsten Carbide Cutters. Solid Hardened Steel Bodies with Anti-Kickback Design. Build-up & Heat Resistant Teflon Coating. Alloy blade with high-grade welding, stable quality high efficiency. Cemented carbide constructed,great replacement for your old one. Specification: Material: Cemented carbide Color: Yellow Shank Diameter: 8mm Package Including: 6 * Cleaning Bottom Router Bits Note: At the trepanning,please wear good protective measures,in case of wood chips splash damage eyes. Size for manual measurement, there may be a 0 to 5 mm error, belongs to the normal phenomenon.