Can be installed in electronic engraving machine, hangings mill, hand mill and other machines 180-7000 mix set include: 180, 240, 400, 600, 800, 1000, 1500, 2000, 2500, 3000, 5000, 7000 of each All with 2.35mm for a most power drills and grinders Suitable for polishing all kinds of metal, stone, wood, jewelry, bone teeth, and so on Manufactured of sandpaper materials, practical and durably, Manufacturer: Kaeltsyn