5 Pack, 4.5" x .045" x 7/8", Metal Cutting 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.