About this item Package includes: 9 grades from coarse to fine, which are 40 , 60 , 80 , 100 , 120 , 180 , 240 , 320 , 400 ,600 10 pieces for each grade, enough to meet your different polishing needs Material and grit mark: the 6-hole triangle sandpaper attaches with aluminium oxide abrasive measures about 90 x 90mm; with grit mark on the back, it is easy for you to use according to your real needs; note, the smaller the number, the rougher the polishing effect, the larger the number, the finer the polishing effect Perfect Size90 * 90 * 90mm, pre-punched with 6 holes for dust extraction, suitable for 90mm triangle sanders. Wide ApplicationThe triangle sandpaper is widely used in rust removal, polishing or grinding non-metallic objects on metal surface, such as plastics, wood, rubber, leather, glass, stone and so on High qualityWith standard size, high quality, the uniform and fine surface sandpapers have good polishing effect, and they are sturdy and anti-static; the pre-punched 6 holes is for dust extraction