Bisco of Florida has for sale Z4000F Zircotex Flap Discs. These Coated Abrasives Zirconia are 4" x 5/8" 40 Grit Z4000F. Bisco Tool Supply sells Alumina Flap 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.