United Abrasives- SAIT 22055 Type 27 7-Inch x 1/8-Inch x 7/8-Inch 8500 Max RPM Pipeline - Long Life Specialty Grinding Wheels, 25-Pack Designed and manufactured to perform both cutting and light grinding. Only wheel designed for both cutting and light grinding, eliminating the need for 2 separate wheels General purpose formulation provides optimum performance over a wide range of applications All sizes reinforced with the highest quality fiberglass for maximum safety and performance Super-Lock Hub on all 5/8-11 threaded arbors in the safest, bibration-free design.