Specialty Diamond abrasive pads are the perfect solution for grinding and polishing hard materials. Manufactured using electroplated diamond technology, this 400 grit diamond pad is the steep after 200 grit when polishing glass, granite and natural stone, concrete, ceramic and other hard material.Use the 400 grit pad following the 200 grit pad as the next step in the polishing process, the 400 grit pad will remove the 200 grit marks as well as prepare the surface for your next grit. Ideal for smoothing sharp glass corners and edges in stained glass projects, polishing edges on natural stone tile and polishing lapidary rock specimens. Use the 400 grit pad for polishing concrete and terrazzo floors in hard to reach areas such as corners and stairs. Hardin diamond abrasive pads will attach to any triangular hook and loop oscillating pad.