These professional quality 4" Resin Filled turbo smooth cup grinding wheels feature light weight thin flat body for less stress on the grinder than the normal steel body. Designed for faster and more aggressive, chip-free grinding and finishing on granite and marble. Loaded with high grade diamonds dispursed evenly through the matrix. Three option diamond grit sizes: COARSE, MEDIUM, FINE - to have the best performance on surfaces, corners, edges and angles of granite, marble and other natural stone surfaces.