This 8 X 20mm 1/4"" Straight Metric Cutter 501793 is an ideal addition to anyone's tools, whether it be for the garden, garage or DIY. It features TCT cutting edges and a strong, hardened steel shank. The twin fluted design provides a smooth finish and it is suitable for general routing, grooving, rebating, dados, mortising and edge trimming. It has a maximum RPM of 24,000. Silverline offers a LIFETIME warranty for all hand tools and a 3 YEAR warranty for power tools, air & petrol tools.