Trend hss single flute straight cutter 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 the tc grades but can be more suitable for certain applications these cutters are suitable for grooving rebating mortising and drilling the single flute cutters offer fast free cutting if you require a cleaner cut please use two flute