Saitech Ultimate Performance - Stainless Steel. Combines fast stock removal with long life. Stainless steel and other high tensile alloys. Ferrous metals (iron, steel, welds, etc.). Specifications: Max RPM - 6600, 5/8-11 Super-Lock hub. Tech Info: Manufactured with patented 3M Cubitron grain to outlast standard aluminim oxide wheels. Special bonding formula allows for very fast stock removal on many types of metals. Designed to provide very long life for fewer wheel changes and less downtime. All sizes reinforced with the highest quality fiberglass for maximum safety and performance.