This 1PCS Core Box Router Bit is designed for large round-bottom groove cutting, semi-circular slotting, decorative line routing, and wide channel woodworking applications. It features a 1/2 inch / 12.7mm shank, 3 inch / 76.2mm cutting diameter, approx. 43mm cutting height, and approx. 88mm overall length. The radius ball nose profile helps create U-shaped grooves, curved bottom channels, semi-circular slots, and large decorative grooves on wood, MDF, plywood, particle board, multilayer board, and similar materials. The 76.2mm cutting diameter is suitable for large groove profiles, cabinet decorative routing, furniture line work, and CNC woodworking projects. This router bit can be used with compatible routers, router tables, and CNC router equipment using a matching 1/2 inch collet. Please secure the workpiece before operation and adjust cutting depth, speed, and feed rate according to the material and machine capability.