Product Details + Ideal for removing damages or fine welding spatters and maintaining the smooth surface of the welding table. Large stone is made of top-grade silicon carbide. 100 grit on top and 400 grit at the bottom can be used for standard table surfaces. Non-slip rubber at the bottom. Material:Stone: Silicon CarbideBase: Plastic DimensionWith Base: 7.4″ x 2.2″ x 1.5″Stone only: 6″ x 2″ x 1″ GritTop: 100Bottom: 400