Shank Diameter: 1/4", Cutting Diameter: 1/4", 5/16", 3/8", 1/2"; Cutting Depth: 13/16", 1", 1-3/16", 1-3/16" C3 Micro Grain Tungsten Carbide Cutters with Anti-Kickback Design, Cleaner Cutting, Smooth Rotation, Fast Operation. Professional Straight and Dado Router Bit Set, Suitable for all types of dado and straight cutting, routing and trimming operations. Can be used on CNC and other automatic routers as well as handheld and table-mounted portable routers. Perfect for making dado and groove milling and all types of straight cutting work on all composite materials, plywood, hardwoods and softwoods. Material: Solid Hardened Steel Blade Material: Industrial Grade Micro Grain Carbide Type: Straight Bits Shank: 1/4" Shank Cutting Diameter: 1/4", 5/16", 3/8", 1/2" Cutting Height (Approx.): 3/4", 1", 1-1/4", 1-1/4" Cutting Height: 20mm, 26mm, 30.7mm, 30.7mm [Metric measurement results are accurate.]