Premium Aluminum Oxide Material: 4 1/2 grinding wheels are made of a combination of premium industrial grade aluminum oxide particles, strong and durable, with extreme grinding action, higher material removal rate, and unparalleled excellent performance in terms of grinding life, speed, and accuracy Excellent Grindding and Up 30% Performance Improvement: Maximum speed 13,300 RPM and 80 M/S achieving high efficiency and precision grinding, ideal for cleaning, rust removal, deburring and polishing; High concentration of abrasive disc particles, stronger grinding effect with smoother operation, grinding performance is upgrade 30% Safety and Reliability: Reinforced with double-layer fiberglass mesh, which ensures excellent safety and stability, and is not easy to break, and meets the international standards and safety requirements; With The depressed center design easy to hard-to-reach areas, and is suitable for multi-purpose grinding discs for surface, contour, edge and radius grinding Extra Long Life and Durability: Suitable for professional applications, longer lasting and more durable; Features near-perfect heat dissipation to minimize heat burns, greatly time saver for replacing grinding wheel; In addition, each grinding disc is supplemented with moisture-proof fiber cloth to ensure its performance is not affected by moisture and corrosion Wide Range of Applications: This metal grinding wheel is ideal for high speed and aggressive grinding in professional metalworking, maintenance repairs and the construction industry; Ideal for grinding, cleaning, rust removal, deburring, polishing and more; Effectively used for steel, stainless steel, aluminum, copper and other metals Compatible with Angle Grinders: The grinding discs are 4.5 inches in diameter, 1/4 thick, 7/8 arbor, compatible with most standard angle grinders ASIN B0D732FG3D Model GD-50 Grit Type Medium Brand Name Revvstark Unit Count 50.0 Count Manufacturer Revvstark Material Type Aluminum Oxide Item Thickness 0.25 Inches Item Dimensions 14 x 14 x 0.1 inches Construction Type Aluminum Compatible Devices Angle Grinder Grit Material Type Aluminum Oxide Compatible Material Metal, Stainless Steel, Aluminum, Copper Included Components 55 pack 4-1/2 grinding disc Item Dimensions L x W 14 L x 14 W Maximum Rotational Speed 13300 RPM