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
$4.11
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.

Dynabrade 53270 7" (180 mm) Dia. Right-Angle Disc Sander
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3M 22392, Roloc Disc 361F, 24 YF-weight, TR, 3 in, Die R300V, 7000045090
Dynabrade 78055 1" W x 24" L Medium NWN DynaBrite Belt, 10/pack
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3M 22407, Roloc Disc 361F, 80 YF-weight, TR, 1-1/2 in, Die R150S, 7000045099
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Air Turbine Tools 310RSV - 1/4" Router Hand Tool Series with Brake, 40,000RPM, 33444 
