Package includes - comes with 504 sanding bands, 24 sanding drum mandrels, 2 keyless drill chucks and 1 combination wrench, total 531 pieces in 1 set Essential 7 grit accessory - these sanding marks contain 6 sanding grits (80 grit, 120 grit, 150 grit, 240 grit, 320 grit, 400 grit, 600 grit) and 3 diameters (1/2", 3/8" and 1/4"). Each grit and size has 24 sanding bands to use and replace Universal Drum Chucks - Reusable 24 piece drum chucks contain 3 diameters: 1/2", 3/8" and 1/4", 8 pieces for each size. Common and standard size suitable for all rotary tools like Dremel etc.Easy to install - make sure the drum has been screwed in tightly, drum chucks with self-expanding rubber cushion, which makes the sanding bands close to the chucks firmly and allows for a better finish; Note: Please wear professional safety goggles to protect your eyes because there may be flying grains when the sanding drum rotates at high speed Wide compatibility - standard and standard size drum sander set which are widely applied in the surface of smoothing and curved edges, suitable for polishing soft and hard materials, perfect for home improvement, artwork, woodwork and other finishing and DIY workPacking Size: 26*24*3cm Specifications Sanding bands size: 1/2 inch, 3/8 inch and 1/4 inch Drum Chucks Size: 1/2 inch, 3/8 inch and 1/4 inch Material of sanding bands: aluminum oxide Package includes 80 grit: 24 * 1/2 inch sanding bands 24 * 3/8 inch sanding bands 24 * 1/ inch sanding bands 4 inch 120 grit: 24 * 1/2 inch sanding bands 24 * 3/8 inch sanding bands 24 * 1/4 inch sanding bands 150 grit: 24 * 1/2 inch sanding bands 24 * 3/8 inch sanding bands 24 * 1/4 inch 240 grit: 24 * 1/2 inch sanding bands 24 * 3/8 inch sanding bands 24 * 1/4 inch sanding bands 320 grit 24 * 1/2 inch sanding bands 24 * 3/8 inch sanding bands Bands 24 * 1/4 inch sanding belt 400 grit: 24 * 1/2 inch sanding belt 24 * 3/8 inch sanding belt 24 * 1/4 inch sanding belt 600 grit: 24 * 1/2 inch sanding belt 24 * sanding belt 3/8 inch24*1/4 inch sanding bands8*1/2 inch drum chucks8*3/8 inch drum chucks8*1/4 inch drum chucks1*self-tightening chuck (2.35mm)1 * self-tightening chuck (3.17 mm) 1 * Combination wrench Note Please wear professional goggles to protect your eyes, because there may be flying grains when the sanding drum rotates at high speed. The sanding drum will wear out faster on the metal surface, please replace the sleeves timely in order to achieve better sanding effect. Please keep them away from children.