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Features Drum Sanding kit turn your electric grinder or other rotary tool into a high-speed sander Drum mandrels with self-expanding rubber cushion, making the sanding bands close to the mandrel firmly and achieving better finishing. Widely applied in nut-carving, wood, metal, plastic, jade, circuit board and other DIY finishing and working. Diameter 1/4",material: aluminum oxide Rubber expansion-drum mandrels - slide bands over drum & tighten screw for non-slip fit Package include 100pcs 1/4 inch 80 Grit sanding bands, 2pcs replacement mandrels