4-1/2″ x 1/4″ x 5/8″-11, General Purpose Metal Grinding Wheel, 3 Full Sheets Of Fiberglass For Durability & Safety, Use Of 100% Virgin Grain For Enhanced Removal & Long Life, Proprietary Material Mix To Ensure Premium Performance, Premium Resin Bonds 100% Inspected Before Use, Heavy-duty Cutting & Grinding Of Ferrous Metal Such As Steel, Iron, Weld Blending & Edge Grinding Aggressive Material Removal.