7″ x 1/4″ x 5/8″-11″, Masonry, Grinding Wheel, Silicon Carbide Grain For Long Wheel Life In All Masonry Materials, High Grain Concentration For Aggressive Grinding Action & Smoother Running Wheels, Proprietary Wheel Design Ensures Durable Long Life Wheels, 3 Full Sheets Of Glass In Every 1/4″ Wheel & 2 Full Sheets In Every 1/8″ Wheel For Added Durability & Safety.