Package includes - 120 pieces of sanders in 3 diameters: 1/2", 3/8" and 1/4", 40 pieces per size, and 12 pieces sanding drum in 3 diameters: 1/2" , 3/8" and 1/4", 4 pieces per size; total 132 pieces Essential accessory - 120 grit standard and standard size sanding belts used for smoothing surface and curved edges, polishing soft and hard materials, such as DIY, artwork art and woodwork Easy installation - drum chucks with self-expanding rubber pad, making the sanding bands close to the chuck firmly and getting a better finish; In case the sanding belt comes loose from the chuck during use, please make sure the drum has been screwed on and is very close to the sleeve Note: Please wear goggles professional safety gear to protect your eyes, because there may be lump particles when the sanding drum rotates at high speed; the sanding drum will be drawn to the metal surface faster, please replace the sleeves timely in order to get the best sanding effect Bonus - come with a free plastic box, convenient for store and recovery Package includes 1/2" x 40 sanding bands 3/8" x 40 sanding bands 40 1/4" x 40 Sanding Bands 1/2" x 4 Drum Mandrels 3/8" x 4 Drum Mandrels 4 1/4" x 4 Drum Chucks Free Plastic Box x 1 Note Wear professional goggles to protect your eyes, because there may be dust specks when the sanding drum rotates at high speed. The sanding drum will be attracted faster on the metal surface, please replace the sleeves timely in order to achieve the best sanding effect. These products are not edible and keep them away from babies under 3 years old.