Zircotex Coated Abrasives Zirconia Flap Discs 6" x 7/8" 40 Grit Z6000F Alumina Discs for Metal, Stainless, and Aluminum. Type 29 Zirconia Alumina with Fiberglass Backing Plate. Flexovit (Diameter x Arbor) Zircotex Flap Discs. These abrasives are made in the USA by Flexovit High Quality Industrial Abrasive Products.