1-1/2" x 1" Mounted Flap Wheel - 1/4" Shank - Zirconia Z-COOL - 60 Grit, INOX Active grinding additives in the coating substantially improve the stock removal rate, prevent loading and result in cooler grinding. For coarse grinding work with a high stock removal rate and cool grinding. Their flexibility enables them to adapt perfectly to the contours of the workpiece..