Specification： Suitable For: Metals, Fiber Glass, Stone & Wood. Diameter: 4 1/2″ Arbor Hole Size: 7/8″ Thickness: Regular Grit: Blue Abrasive: Silicon Carbide (Coarse) Type: T27 Max Operating Speed: 11,000 RPM Use: Right angle grinder Quantity: 10 Discs Feature： Easy Strip Discs are extremely versatile and can be used in many applications where quick cleaning and stripping is required. These durable clean & strip discs make easy work out of removing paint, rust, scaling, oxidation and cleaning welds. Blue strip discs are more rigid making them ideal for faster material removal and irregular surfaces. .