http://www.smithandarrow.co.uk/html/Products/Abrasives-for-Metal-5/Flap-Discs-3/index.html
INOX Stainless Steel Grade Zirconia Flap Discs - these Flap Discs are made to the highest standard for fast grinding, blending, and finishing through Stainless Steel. They are engineered to be long lasting providing very good value for money, and are also excellent for cleaning up Mild / Black Steel, Aluminium, and other metals.