Package Includes - Comes with 330 pieces sanding bands and 12 pieces sanding drum mandrels, 2 pieces self-tightening drill chuck and 1 piece combination wrench, totally 345 pieces in 1 set, perfect for your various needsEssential 3 Grit Accessory - These sanding bands contain 3 sanding grits (80 grit, 120 grit, 240 grit) and 3 diameters (1/2", 3/8", 1/4"), 50 pieces per diameter in 120 grit, 30 pieces per diameter in 80 and 240 gritUniversal Drum Mandrels - 12 pieces reusable sanding drum mandrels contain 3 diameters: 1/2", 3/8" and 1/4", 4 pieces for each size, common and standard size for all rotary tools etc.Easy to install - make sure the drum has been screwed tightly, drum mandrels with self-expanding rubber cushion, which makes the sanding bands close to the mandrel firmly to achieve a better finish; Note: please wear professional safety glasses to protect your eyes because there may be flying grains when the sanding drum rotates at high speedWide compatibility - set of standard and standard size drum sanders that are widely applied in smoothing surface and curved edges, suitable for polishing soft and hard materials, perfect for home improvement, artwork,Welcome to meet