The Vextra is designed to grind steel, stainless steel and non-ferrous metals for the Ex ZONE where spark reduction is a priority. Also great for removing rust, burrs, mill scale, paint on metal surface as well as epoxy, glues and adhesives without clogging the grinding surface. The Vextra grinding disc can be used on natural stones, engineered stonequartz surface, wood and rubber. Vextra grinding disc is available in 4.5, 5 and 7 with 78 arbor or with 58-11 zinc hub.