This 4 X 12mm 1/4" Straight Metric Cutter 178044 is an ideal addition to anyone's tools, whether it be for the garden, garage or DIY. It features a 1/4" Straight Metric Cutter with a TCT cutting edge and a strong, hardened steel shank. It is single fluted for a smooth finish and suitable for general routing, grooving, rebating, dados, mortising, and edge trimming. Maximum RPM is 24,000. Warranty: LIFETIME for all hand tools; 3 YEAR for power tools, air & petrol tools.