Premium grain for added wheel life and speed * Enhanced formulations for long life and optimal performance * High quality resin bonds, 100 percent inspected for consistency and quality * 4-inch by .045-inch, 5/8-inch arbor, 15,200 maximum rpm, Type 1, A60T Specification * 4" x .045", 5/8" arbor, 15,200 maximum rpm, Type 1, A60T Specification