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Diameter: 4-1/2in. (114.3mm), Bore: 7/8in. (22.2mm). SSG: 390. Also for angle head machines. These wheels replace paper sanding discs and have a more flat face than the dish wheel. The sanding discs have a nearly flat shape with just a slight curvature for most effective use of the coated area. They have a smooth cutting action and are easy to control. Recommended speed range: 5,000-15,000 RPM.