The shank of the mandrel must match the size of the power tool collet or drill chuck, and the pilot diameter must be compatible with the size of the cartridge roll.
3M 45120, Cartridge RoII Mandrel, 3/32 in x 3/4 in x 1/4 in, 7010328349
$4.25
Factory Stock, 7-10 Day Leadtime
3M Cartridge Roll Mandrel is a tool attachment that holds an abrasive cartridge roll (sold separately). Together, the mandrel and cartridge roll enable the user to grind or finish hard-to-reach areas of a workpiece, such as angles and curves. The mandrel attaches to a rotary tool such as a die grinder or drill, and comes in different sizes to fit a variety of cartridge roll sizes.

3M 33078, Scotch-Brite Hookit Production Clean and Finish Disc, 5 in x NH, A VFN, 7100138331
3M 17219, Scotch-Brite EX2 Deburring Wheel, X2-WL, 8A Medium, 8 in x 1 in x 3 in, 7000120916
Norton 66623303912 - 2" Dia. XCS Grit Aluminum Oxide Type III, Bear-Tex Non-Woven Quick-Change Disc, 25 Each
3M 64460 Scotch-Brite Durable Flex Belt, DF-BL, A/O Medium, 3/4 in x 18 in, 7000121130
Dynabrade 90406 1/2" W x 30" L Very Fine NWN DynaBrite Premium Belt, 10/pack
Insize ISR-LS601E, SURFACE ROUGHNESS REFERENCE SPECIMENS, 3.9_in, 6940561934786
Standard Abrasives 721127, A/O Straight Cartridge Roll, 1/8 in x 1 in x 5/64 in 120, 7100102798
Dynabrade 93167 4" Dia. X 1/4" Dia. Shank, 120 Grit, A/O, Spindle-Mount Sanding Star
Dynabrade 61201 RaptorVac Electric DrumVac Kit, Dual Operator, For Use With Tools 
