1Cemented Carbide Construction: The cemented carbide construction is an excellent substitute for your old architectural molding router bit 2Non Rebound Design: Milling cutter body is made of solid carbide with non rebound design, more safe and stable to use 3For Various Materials: Used in MDF, solid wood, particle board, plywood, wooden door frames, wooden window, cabinets, boxes, etc. 4For Engraving And Trimming Machines: Woodworking shape cutter tool can be used for carving wood lines, suitable for engraving machines and trimming machines 50.003in Tolerance Balance: Tool holder diameter is 12mm, tool head diameter is 25mm, balance for 0.003in tolerance Item Type: Architectural Molding Router Bit Product Size: Shank Diameter: Approx. 12mm / 0.47in, Cutter Head Diameter: Approx. 25mm / 0.98in Material: YG6 primary alloy + 45 carbon steel Balance: 0.003in Tolerance Uses: Used to carve wood lines 1 x Architectural Molding Router Bit 1 x Storage Box Please allow tiny size error due to manual measurement. Thanks for your understanding.