Features INDUSTRIAL GRADE MATERIAL Carbon steel has high strength and durability, while the carbide blade ensures excellent performance. Wide application: universal 8mm shank, suitable for desktop, hand or CNC applications as well as leveling wooden boards, cleaning the bottom and grooves. 4 BLADE DESIGN - Backlash free design, 4 cutting blades, faster cutting speed and longer blade life, allowing you to rotate the tool even if one side becomes dull. You can replace the blade instead of replacing the entire cutter. Reliable working: screw locking, large chip space, good chip removal, easy cut and low milling resistance. Oil-free storage, long-lasting rosiness. EASY INSTALLATION Due to its compact size and light weight, the surface router bit is very convenient to install within a few minutes. Specification: Item Type:Surface Router Bit Material: carbon steel, carbide Shaft diameter: approx. 8 mm / 0.31 inches. Cutting diameter: approx. 40 mm / 1.57 inches. Cutting knife size: approx. 10 x 10 mm / 0.39 x 0.39 inches. Package list: 1 x surface cutter. 1 x storage box. Note: There may be a size error. Package List 1 x Surfacing Router Bit 1 x Storage Box