Feature: 1. Industrial Grade Material: High carbon steel has high strength and durability, while cemented carbide blade ensures excellent performance. 2. Wide Application: Universal 8mm shank, suitable for desktop, handheld, or CNC applications as well as for leveling wooden boards, cleaning the bottom, and grooving. 3. 4 Blade Design: Anti backlash design, 4 cutting blades, faster cutting speed and longer blade life, which also allows the you to rotate the tool when one side becomes blunt. You can replace the blade instead of replacing the entire router bit. 4. Reliable Work: Screw locking, large chip cutting space, good chip removal, light cutting, and low milling resistance. Oil free storage, long lasting rust resistance. 5. Easy to Install: Comes with a compact size and a light weight as well, the surfacing router bit is very convenient to install within several minutes. Specification: Item Type: Surfacing Router Bit Material: High Carbon Steel, Cemented Carbide Shank Diameter: Approx. 8mm / 0.31in Cutting Diameter: Approx. 40mm / 1.57in Cutting Knife Size: Approx. 10 x 10mm / 0.39 x 0.39in. Package List: 1 x Surfacing Router Bit1 x Storage Box Note: There may be size error.