4-1/2" x 1/4" x 7/8" The Ultimate Grind™ Ceramic Grinding Wheels, Type 27, Max RPM 13,300, United Abrasives 20204

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.