Features Bit Specifications: Insert spoilboard bit with a cutting diameter of 37mm (1‑1/2 inch), blade size of 12x12mm, shank diameter of 8mm, with standard size for stable operation. 3 Flutes Design: This bit is 3 flutes anti backlash design, ensuring faster cutting speed, each blade has 4 cutting edges, users can rotate the blade to replace it with a new one. Multiple Functions: This 3 flute bit can be used for planing large plywood and wood surfacing, fine machining and slotting, with fine finish and better 90 degree angular clearance. Durable Materials: The router bit is made of excellent high carbon steel, which has high strength and good durability, the carbide blades are wear resistant and impact resistant. 8mm Shank Dia: The spoilboard bit has a standard 8mm shank, ensuring stable and accurate installation, used for CNC and automatic milling machine, handheld or desktop router, etc. Specification: Item Type: Spoilboard Bit Material: High Carbon Steel, Carbide Shank Diameter: Approx. 8mm / 0.3in Cutting Diameter: 37mm (1-1/2 inch) Cutting Blade Size: Approx. 12 x 12mm / 0.47 x 0.47in Package List:1 x Spoilboard Bit1 x Wrench3 x Spare Blades3 x Spare Screws1 x Storage Box Note:There is a slight error in size. Package List 1 x Spoilboard Bit 1 x Wrench 3 x Spare Blades 3 x Spare Screws 1 x Storage Box