... polishing the surface is smooth 3.low cost Diamond Polishing sheet Main feature:*Diamond polish film use on ceramic , stainless steel , plastic ... materials on uniform polyester backing.*9,6,3,1 um diamond polish film and 0.05 um aluminum oxide polish film ... mmFilm micron grade:9 um , Diamond , Blue ( 3M-9D )6 um , Diamond , Clear ( 3M-6D )3 um , Diamond , Pink ( 3M-3D )1 um ...