6 Bottom Cleaning Drill Bits with 8mm Shank, Size: 8x18; 8x20; 8x22;8x25; 8x30; 8x32. Solid hardened steel body with anti-kickback design, build-up and heat resistant Teflon coating C3 micro-grain tungsten carbide burs, design double-edged cutting edge, excellent concentricity Ideal woodworking tool for cutting all composition materials, plywoods, hardwoods and softwoods Contents of the package: 6 bottom cleaning bits. Product Description Features: C3 Micro-Grain Tungsten Carbide Burrs. < p>Strong hardened steel body with anti-kickback design. Teflon coating resists buildup and heat. Alloy blade with high quality welding, high stable quality efficiency. Cemented carbide built, great replacement for your old one. Specification: Material: cemented carbide Color yellow Shank diameter: 8mm Package including: 6 x bottom router bit cleaning Note: When trepanning, please wear good protective measures, in case of wood chip splash damage the eyes. Size for manual measurement, there may be a