High Speed Steel Burs are known for their hardness & durability. They also stay sharper longer than conventional tungsten vanadium burs. HSS burs are hand fluted which means they may not have the consistency of tv burs. HSS burs have 3/32 shanks and are sold individually. High Speed Steel burs are identified by number (1-34) and are sized in millimeters from 0.9 to 11.1. Not all sizes are available in every shape.