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.