Trend Professional HSS Router Cutters 3/20X1/4HSS - Two Flute Straight Cutter 6.3mm Diameter x 16mm Cut Key Features: These are made from a single piece of High Speed Steel, ground with a very fine edge They are only suitable for non abrasive materials, but will give a superior finish in soft timbers Generally HSS cutters are slightly less expensive than their TC grades, but can be more suitable for certain applications Suitable for general grooving and rebating Specification: D: 1/4 inch (imperial diameter) D: 6.3 mm (metric diameter) C: 16 mm (metric cut length) OL: 48 mm (overall length) Shank Diameter: 1/4 inch