Shank diameter: 6mm, cutting diameter: 1/4, 5/16, 3/8, 1/2, cutting height: 13/16, 1-1/16, 1-3/16 , 1-3/16, 1-7/32. Industrial grade C3 micro-grain carbide burrs with double edge cutting design, high performance, sharper cut. Build-up and heat-resistant Teflon coating can effectively prevent breakage or bending under high-speed working conditions. Flush cutter with top end bearing , ideal for fast, smooth and precise cuts for laminates and jigs. Use on CNC and other automatic routers as well as portable table-mounted and hand-stretched routers, ideal for cutting all composite materials, plywood, hardwoods and softwoods. Features: Industrial grade C3 micro-grain tungsten carbide burr. Solid hardened steel body with anti-kickback design. Coating of Teflon resistant to heat and build-up. Cooked on a heat-resistant coating prevents the build-up of sawdust, resin and pitch. Carbide blade of industrial grade tungsten. High hook and shear angles allow the cutters to slice smoothly, producing clean, splinter-free material. Specifications: Color: Blue Body Material: Solid Hardened Steel Blade Material: Micro Tungsten Carbide -C3 grit Maximum rotational speed: 12000 Contents: 1/4*6.35mm Flush Trim Router bit 1/4*7.96mm Flush Trim Router bit 1/4*9.52mm Flush Trim Router bit 1/4*12.7mm Flush Trim Router bit