Grier Abrasives 1/2" Head Diam x 1/2" Thickness, B121, Ball End, Aluminum Oxide Mounted Point GreenGray, Fine Grade, 25,000 RPM. Write the first review. MSC Part #: . Mfr Part #: B121N217231 . More Product Info in Catalog. Price: ea. Web Price: ea. Qty. Total Price. Add to Cart. Add to List. Request CMI Labels. In Stock Hassle Free Guarantee We'll exchange or refund any ...