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AConnet Alumina Oxide 4-1/2 Inch Grinding Sanding Discs 60 Grit Perfect for Grinding, Stock Removal, Beveling, Weld Blending, Rust Removal and Blending. Feature: -- Has good abrasion resistance, anti-static and anti-clogging; -- Constructed of High quality alumina material; -- Durability and reinforcement. Specifications: Material: Aluminum Oxide Outer Diameter: 115mm/4.5inch Inner Diameter: 22mm/0.9inch Thickness: 5mm/0.2inch Grit: 60 Max Speed: 13000 rpm Package Included: 20 Pcs 4.5" Grinding Wheel Note: Please confirm the product specifications before purchasing.