Double edge cutting, excellent concentricity for fast, smooth and precise cuts for laminates and jigs and fixtures (Please get the promo code on the product page when purchasing to get a cheaper price.)< /p> Industrial grade carbide burrs and steel shank. High quality C3 tungsten carbide burrs with fine grit for long lasting performance. Cutting height: 1 inch, cutting diameter: 6.35mm, 7.96mm, 9.52mm, 12.7mm (1/4", 5/16", 3/8", 1/2" with a top end bearing; Shank: 6.35 mm (1/4") A build-up and heat-resistant Teflon coating can effectively prevent breakage or bending under high-speed working conditions. < p>For use on CNC and other automatic routers, as well as portable and table-mounted routers.