12 pcs/set 1/4 inch 15pcs/set Professional Shank Tungsten Carbide Router Bit Cutter Set Kit AZ9526 SummaryShank Diameter: , 1/4 inch(6.35mm),1/2 inch(12.7mm)Suitable for wood, MDF board.Supplied in handy wooden storage case.The product is drilled using a professional electric drill, bench drill.Features:Shank Diameter: , 1/4"(6.35mm),1/2 inch(12.7mm)This cutter set contains a range of the most widely used cutters for decorative woodworkingUsage: The product is drilled using a professional electric drill, bench drill. Rpm 800-1000 or as close to as possible while also adding water for cooling the holes during operation is an advantageSupplied in handy wooden storage caseSuitable for wood, MDF board, hardwood and softwoodSpecifications:6mm (1/4") straight bit.12mm (1/2") straight bit.16mm (5/8") straight bit.12.7mm (1/2") 90degree "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:Professional Shank Tungsten Carbide Router Bit