The abrasive stone is high quality material red corundum sand with uniform particles, and more , good abrasion resistance, can be used for long time. to remove rust from metal castings and will not rust or fall out like the steel brush. Rotary tool grinding stone wheel can play an excellent polishing effect with uniform grit, wear-resistant, abrasive grain cutting , grinding stainless steel and other metals with less dust, much faster grinding, save time-off. The is cleaner and brighter after polishing. The sanding wheel set contains 3 sizes of grinding stone: 10mm cylinder shape, 15mm cylinder shape, 10mm shape(14 pcs each size). The 1/8inch(3mm) shank can be used with power drills and most rotary tools. Abrasive mounted stone grinding set suitable for trimming, polishing and grinding a variety of objects:mold, metal, plastic, jade, and wood, etc. Multiple design fit into tight spaces for other grinding and shaping needs, such as curved, flat and slotted surfaces. color:As shown