Flexovit A0406 High Performance Grinding Wheels offer High Productivity, Versability, and Durability. A24/30T Heavy Duty offers Extremely rugged and hardworking discs that are ideal for tough applications - beveling, edge, or flame cut grinding. Grinding Discs - USA Abrasives 4"x1/4"x5/8" Flexovit Heavy Duty 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.