A2224 Flexovit Flexon Grinding Wheels offer Maximum Productivity, Premium Abrasive Grain, and Longest Life. ZA24P Fast Grind Wheels offer Fastest Stock removal rate of any zirconia grinding wheel. Grinding Wheels - USA Abrasives 5"x1/4"x7/8" Flexovit Fast Grind Depressed Center Grinding Wheel for Metal, Stainless. Flexovit Industrial Abrasive Wheels. Made in the USA by Flexovit High Quality Industrial Abrasive Products. Sold in box quantities of 10.