Usage Tips:Double edge cutting, excellent concentricity for fast, smooth and precise cuts for laminates and jigs. Industrial grade carbide burs and steel shank. Premium C3 fine grit tungsten carbide burs 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 top end bearing; Tail: 6.35mm(1/4")Build-up and heat-resistant Teflon coating can effectively prevent breakage or bending under high-speed working conditions.Use on CNC routers and other automatic routers, as well as portable and table mount routers.Features:Industrial grade C3 micro-grit tungsten carbide cutter.Solid hardened steel body with anti-kickback design.Teflon coating resists heat and buildup.Baked on a coating heat resistant prevents build up of sawdust, resin and pitch. Industrial grade tungsten carbide blade. High hook and shear angles allow the cutters to slice smoothly producing clean material and splinter free.Specifications:Color: Blue Material: YG6Xv Shank diameter: 1/4" Cup Diameter: 6.35mm, 7.96mm, 9.52mm, 12.7mm (1/4", 5/16", 3/8", 1/2") Cutting height: 20.63mm, 27mm, 30.16, 31mm(13/16", 1-1/16", 1-3/16", 1-7/32)Total Length: 66.7mm, 69.9mm, 76.2mm, 77mm(2-5/8", 2-3/4", 3", 3-1/32") Body Material: Solid Hardened Steel Blade Material: C3 Micro-Grain Tungsten Carbide Maximum Rotational Speed: 12000 Contents:1/4"*6.35mm Flush Trim Router bit1/4"*7.96mm Flush Trim Router bit1/4"*9.52mm Flush Trim Router bit1/4"*12.7mm Flush Trim Router bitNote: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.