Common and standard size fit for all rotary tools make sure the drum have been screwed tightly, drum mandrels with self-expanding rubber cushion, making the sanding bands close to the manderl firmly and achieving better finishing; Note: please wear professional safety glasses to protect your eyes, because maybe there are flying grits when the sanding drum turning at high speed commonest and standard size drum sander set which are widely applied in smoothing and curved edges, polishing both soft and hard materials, like home improvement, artwork , woodworks and other DIY finishing and working colour:Reddish brown material:Metal + alumina Package Contents: 20 * 6.3mm abrasive belts (80 rings) 20 * 6.3mm abrasive belts (120 rings) 20 * 6.3mm abrasive belts (240 rings) 20 * 6.3mm abrasive belts (320 rings) 20 * 6.3mm abrasive belts (400 mesh) 20 * 6.3mm abrasive belt (600 mesh) 20 * 9.5mm abrasive belts (80 rings) 20 * 9.5mm abrasive belts (120 rings) 20 * 9.5mm abrasive belts (240 rings) 20 * 9.5mm abrasive belts (320 rings) 20 * 9.5mm abrasive belt (400 meters) 20 * 9.5mm abrasive belt (600 meters) 20 * 12.7mm abrasive belts (80 rings) 20 * 12.7mm abrasive belts (120 rings) 20 * 12.7mm abrasive belts (240 rings) 20 * 12.7mm abrasive belts (320 rings) 20 * 12.7mm abrasive belts (400 grids) 20 * 12.7mm abrasive belts (80 rings) 4 * 6.3mm drum mandrels (3) 4 * 6.3mm drum cores (2.35) 4 * 9.5mm drum shaped mandrels (3) 4 * 9.5mm drum cores (2.35) 4 * 12.7mm drum shaped mandrels (3) 4 * 12.7mm drum shaped mandrels (2.35) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.