Feature: 1. INDUSTRIAL GRADE STEEL MATERIAL: CNC spoilboard surfacing router bit select high carbon steel material, which has higher strength and durability, and service life is several times that of No. 45 steel 2. WIDE APPLICATION: The spoilboard surfacing router bit has a 8mm shank diameter and can be used on desktop machine, handheld machine, or CNC 3. BLADE DESIGN: Slab flattening router bit drill with notcher is ideal for cutting tight corners. With a unique 2+2 blade design, the cut bottom has a smoother finish compared to traditional two blade milling cutters 4. REPLACEABLE BLADE: The router bit has an integral carbide blade with four cutting edges that allow the user to rotate the tool when one side become dull. You can also replace the milling cutter blade instead of replacing the entire drill bit, which is an effective solution compared to brazed milling bits and solid carbide auger bits 5. MAIN USES: The router bit is used for resurfacing spoilers, planing large plywood, wood surfaces and finishing, grooving for better performance, finer surface finish and better 90° angular clearance 6. APPLICABLE SCENARIO: This milling bit is ideal for leveling boards, cleaning bottoms and grooving. For CNC and other automatic milling machines as well as handheld and benchtop portable milling machines 7. HIGH EFFICIENCY AND RUSTPROOF: Insert cutter spoilboard router bit is locked with screws, large chip space, good chip removal, light cutting, low milling resistance; The latest black Ti plating technology allow oil free preservation, durable without rust Specification: Item Type: CNC Spoilboard Surfacing Router Bit Material: High carbon steel and carbide Shank Diameter: 8mm/0.31in Cutting Diameter: 38.1mm(1 1/2in) Cutting Blade Size: Approx. 12 x 12mm / 0.47 x 0.47in . Package List: 1 x CNC Spoilboard Surfacing Router Bit1 x Storage Box Note: Please allow tiny size error due to manual measurement. Thanks for your understanding.