4flute CNC Spoilboard Surfacing Router Bit, 1/2Inch (12.7mm) Shank, 21/2Inch (63.5mm) Cutting Diameter, total length is 2.55Inch (65mm). Comes with EXTRA 10 Replacement Blades(12x12x1.5mm,35). The total length may have a 25mm error due to different production batches. Please MAKE SURE the set screws are thigtened frimly before each time use!! And the holder should be clamped at least 20mm.Unique Design: 4 Flute Wood Planer Bit end mills has unique chamfer corner insert design, creates a .And the 4 wing design, resulting in a more balanced tool while running.Also it provide a smoother at the bottom of the cut than traditional twoknife style router bits. Great for planning.The CNC milling cutter comes with 10 EXTRA carbide inserts, resulting in the impact strength and wear resistance, higher density, better compactness, no , uniform and dense metallographic structure, makes the face cutter more .Costeffective: The inserts cutters of the CNC spoilboard bit are foursided and can be replaced, you can also rotate the insert for a new , leading to high costeffectiveness. The design of the milling screw allows for better fixation of the inserts and facilitates replacement.Wide Applications: Spoilboard Surfacing bits are used on CNC and other automatic routers as well as handheld and tablemounted portable routers. Also suitable for router sled machines, Make sure that your router sled is fully stable and squared. For planing & rabbeting MDF,Fiberboard,HDF/,Balsa,High Density Urethane (HDU Board),Plastic/Acrylic,Plywood/Chipboard,Hardwood/Softwood,UltraHighMolecularPlease note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you!Colour:BlackMaterial:steelSize:12.7x63.5x65mmPackage Contents:1 * board breaker1 * wrench10 * blades (12x12x1.5mm, 35)Only the a package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/ 13cm.