This unique flap disc has a curved edge for grinding in corners and tight spaces where standard discs won't work. It can also be used for all other standard flap disc applications. Ideal for mild steel, high-strength steel, hardened steels and stainless steel. Disc will perform best with only light to moderate grinding pressure. Designed for grinding, blending, sanding and finishing on a wide range of materials. 60 grit provides a medium finish.