10PC Mixed Grit Aluminium Oxide Abrasive Sandpaper Rolls KitMade of steel shank and nice quality sand paperUsed on rotary tools or flex shaft to grinding and polishing all kinds of metal, jade, stone, wood, bone, resin, porcelain and so onGlued both ends of the rolls, make it more stable; easy to install and useMAX speed: 25000RPMKit includes2PC 240# grit abrasive sanding paper rolls coarse2PC 400# grit abrasive sanding paper rolls coarse2PC 600# grit abrasive sanding paper rolls coarse1PC 800# grit abrasive sanding paper rolls medium1PC 1000# grit abrasive sanding paper rolls medium1PC 1500# grit abrasive sanding paper rolls fine1PC 2000# grit abrasive sanding paper rolls fineSize of the sandpaper cartridge rolls:Roll diameter 12mm,roll length 28mm,sandpaper overall length 36cm,mandrel size 3/32"(2.35mm),total length 58mmThese aluminum oxide sandpaper cartridge rolls come already mounted on 3/32" mandrel, ready to install in hobby rotary tools or flex shaft and go to work. They are easily getting it channels, filets, recesses, contours, sidewalls and other hard-to-reach spots. As the outer layer wears away, new abrasive is exposed.