Flexovit A0414 Bisco Tool Supply Sells Flexovit USA Made Depressed Center Type 27 Grinding Wheels for Metal and Stainless Steel. Grinding Discs - USA Abrasives 4"x1/4"x5/8" Flexovit Fast Grind Depressed Center Grinding Disc for Metal, Stainless. Flexovit Industrial Abrasive Discs. Made in the USA by Flexovit High Quality Industrial Abrasive Products. Sold in box quantities of 25. High Performance Grinding Wheels offer High Productivity, Versability, and Durability. A30S - Fast Grind offers Agressive grinding with a good wheel life. Ideal for most metals, including stainless and other hard alloys. An excellent "all purpose" spec.