Designed for use on rust, paint, steel, and non-ferrous metals, along with any other surface that needs sanding High performance aluminum oxide with abrasive for extended disc life while also offering an aggressive cut Durable fiberglass back is lightweight, but also offers extra strength and absorbs tool vibration Applicable for grinding, stock removal, edge chamfering/beveling, weld blending, deburring/deflashing, rust removal, blending, cleaning and finishing Disc is semi-open to retard loading on aluminum