DESCRIPTION: Industrial ceramic grain for improved performance and life. Increased efficiency for maximum cordless run time. Sharper grain for aggressive and fast stock removal with a high density grain concentration for longer life. XR Extreme Runtime bonded abrasives are designed to maximize your productivity when used with cordless power tools. Diameter [Metric]: 125 mm. Product Length [Imperial]: 12.5 in. Bore Size [Metric]: 22.23 mm.