Features: Brand new and high quality Suitable for polishing on metal, model, wood sculpture, root sculpture, etc. Steel copper sand diamond wool abrasive sleeve is more durable and wear-resisting. 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 acheiving 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. Specifications: Material:Abrasive Paper Sanding Drums: 8.5x13mm 12.7x14.7mm Drum Mandrels: 6.35x39.5mm 12.7x38.8mm Package Includes: 100Pcs Sanding Drums 2Pcs Drum Mandrels note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.