ITEM NAME:100mm 46# Diamond Coated Flat Lap Wheel Polishing Grinding Disc Tiles Description: Outside Diameter: approx. 4" (100mm) Arbor Hole: approx. 0.79''(20mm) The Cutting Wheels are sharp and strong Perfect for cutting gemstones, glass, ceramics, porcelain, tiles, car.The Cutting Wheels are sharp and strong. 1 Piece Cutting wheels. High precision and smooth cutting. SKU: DMO0022732979004682.