Features: Shank Diameter: 1/4"(6.35mm) This cutter set contains a range of the most widely used cutters for decorative woodworking Supplied in handy wooden storage case Suitable for wood, MDF board, hardwood and softwood Specifications: 6mm (1/4") straight bit 12mm (1/2") straight bit 16mm (5/8") straight bit 12.7mm (1/2") 90deg "V" grooving bit 12.7mm (1/2") dovetail bit 32mm (1-1/4") 45deg chamfer bit 12.7mm (1/2") flush trim bit R6.3mm (1/4") round over bit R9.5mm (3/8") round over bit R6.3mm (1/4") core box bit R6.3mm (1/4") cove bit R4mm (5/32") roman ogee bit Package Included: 12 x Professional Tungsten Carbide Router Bit