Norton® 3" X 7/16" X 3/16" Medium Grade Boron Carbide High performance Dressing Stick is suitable for offhand truing as well as dressing of soft, medium grit and medium-grade vitrified grinding wheels. Rectangle dressing stick is hard and made from boron nitride. It is used for cup as well as saucer shape dressing tool and 10" cutter wheels. It is sold as 5 per case.