This sale is for a new old stock Carborundum BA543-T6-B6 grinding wheel. It is 4" X 1/2" with a 1/2" hole for arbor. 43 grit Aluminum Oxide. Made in USA. Please see pictures. We describe our items as accurately as possible. We do not know everything, so look at the photos as well as reading description completely. I will ship internationally and will combine shipping on multiple purchases.