A24R - Pipeline. Aluminum oxinde grain. For the pipeline industry. Designed and manufactured to perform both cutting and light grinding. Long life. Ferrous metals (steel, cast iron, etc.). Specifications: Max RPM - 6600, 5/8-11 Super-Lock hub. Tech Info: Only wheel designed for both cutting and light grinding, eliminating the need for 2 separate wheels. General pupose 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 wheels is the safest, vibration-free design.