Features Industrial Grade Material: Carbon steel has high strength and durability, while the carbide blade ensures excellent performance. Wide Application: Universal 1/2" shaft, suitable for desktop, handheld 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 when one side becomes dull. You can replace the blade instead of replacing the entire cutter. Reliable work: screw locking, large chip space, good chip removal, easy cutting and low milling resistance. Oil-free storage, long-lasting rust resistance. Easy Installation: Due to its compact size and light weight, the surface router is very convenient to install within a few minutes. Specification: Item type: surface milling cutter Material: carbon steel, carbide Shaft diameter: 1/2 inch, i.e. 12.7 mm Cutting diameter: 2 inches, i.e. 50.8 mm Cutting  size: approx. 12 x 12 mm/0.47 x 0.47 inches Package list: 1x Surface milling cutter 1 x Storage Box Note: There may be a size error. Package List 1 x Surfacing Router Bit 1 x Storage Box