Multiple Specifications: 3 pieces of 8 mm shank 45-degree lock miter router bits, including 1-3/8 inch, 1-1/2 inch, and 2 inch cutting diameters, suitable for materials of various thicknesses. Made of hard alloy steel with high hardness; the heat-treated blade is sharp and smooth. Coated surface provides rust resistance and extended service life. Universal woodworking tool: 45-degree lock miter router bit set designed to join boards at 90 degrees. Easy to use by routing one board vertically and the mating board horizontally. Compatible with MDF, solid wood, particle board, plywood, wooden door frames, wood windows, cabinets, boxes, and similar woodworking applications. Suitable for use with CNC routers, automatic routers, handheld routers, and table-mounted portable routers.