The Strend Pro set of grinding stones is suitable for mini grinders for cutting, drilling, grinding, polishing, cleaning, engraving, and milling. The set includes: 3x collet 1.6 mm, 2.4 mm, and 3.2 mm, grinding stone 26x10 mm, and 1x wrench 3/8".For engraving:12x diamond cutter.For drilling:9x HSS drill bits.Cleaning:3x nylon brush, 3x steel brush, and 1x brass brush.For grinding:2x rubber grinding disc, 6x rubber grinding stone, 10x grinding stone, 4x flap grinding disc, 52x grinding roller, 80x sandpaper, 18x grinding disc.For cutting:2x diamond cutting disc, 36x corundum cutting disc, 2x mandrel, 16x cutting disc.For polishing:1x polishing paste, 1x mandrel, 9x felt disc. Contains a total of 276 grinding stones.