Trend 3/21X1/4HSS Two flute cutter 6.3 mm diameterTwo FluteThese are made from a single pce 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 inchD=6.3 mmC=28 mmOL=59 mmShank Diameter=1/4 inch