The set includes: - 240 pieces of sanding bands in 3 diameters: 1/2", 3/8" and 1/4", 80 pieces per size and 12 pieces of sanding drum in 3 diameters: 1/2", 3/8" and 1/4", 4 pieces per size; 252 pieces Convenient - Standard size and standard 120 grit sanding bands, used for smoothing surface and curved edges, polishing soft materials and such as DIY, artwork 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 drum band sanding loosens from the chuck when in use, please make sure the drum has been screwed in tightly and is very close to the sleeve. Note: Please wear professional safety goggles to protect your eyes, as there may be -Be lump particles when the sanding drum rotates at high speed; the sanding drum will be attracted to the metal surface faster, please replace the sleeves timely in order to achieve the best sanding effectBonus - Comes with a free plastic box, convenient to store and search Note: The data is all measured manually, please allow 1-3cm error, due to the light and display difference, there are will have a certain color difference, the actual object received shall prevail.Note: The data are all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.