High adhrence: Velcro sandpaper adheres well to orbital alatory sanders, twice as much as regular sandpaper. Premium quality Sandpaper from the grinding wheel has an alumina grain structure. It offers good sanding and durability. Idal for polishing, cleaning and more. For furniture, hardware and automotive repair. Used for surface polishing of iron, paint, electronics, wooden furniture and various solid wood boards, professional, sr, efficient, low consumption, improves the resistance wear and abrasive does not fall easily. Spcification: Matriel: Alumina Size: 125 mm/5" thickener: 0.05 mm/0.002" Number of holes: 8 holes Quantit: 10 batteries per bag Color: Black Weight: 56g Number of holes: 8 Instructions 1. You need to add sandpaper to the sticky disc and stick it on the polished. 2 fixed disc. A converter is also necessary to use an electric drill. 3. Due to manual measurement, please allow 1 3mm error. Thank you for your understanding. 4. The monitor is not calibrated of the same way, the color of the lment shown in the photo may be very different from the real one. Please refer to the product rel.