4-1/2" x 1/4" x 5/8"-11 The Ultimate Grind™ Ceramic Grinding Wheels, Type 27, Max RPM 13,300, United Abrasives 20214

Recommended Grinding Use: For use on ferrous metal (iron, steel, welds, etc.) stainless steel and high tensile alloys. Premium high ratio ceramic grain for increased efficiency and performance with an angle grinder.