11/2in Shank: The half round router bit has a standard 1/2in shank, which is mainly used to create half circular bearings or round corners. 2Excellent Materials: Sturdy carbon steel main body and alloy cutter head, has good wear and impact resistance. 3Safe Operation: With anti backlash design, safe operation, often used in automatic desktop portable machines such as CNC. 45Pcs in 1 Set: Including 5pcs half round milling cutters, with different diameters, suitable for milling plates of different radius. 5Applicable Boards: Suitable for wood, medium density fiberboard, particle board, plywood, panel, softwood, hardwood, etc. Item Type: 1/2in Shank Router Bit Material: Carbon steel main body + alloy cutter head Shank Diameter: 1/2in Cutter Head Diameter: 7/8in, 1in, 1-1/8in, 1-1/4in, 1-3/8in Sanding Plank Radius R: 1/8in, 3/16in, 1/4in, 3/8in, 5/16in 5 x Milling Cutters 5 x Storage Boxes