Internally slotted rubber drum expands with centrifugal force to keep abrasive belts tight while grinding. Use with 3M(TM) Inline Sanders (PN28338 and PN28339) for generating straight line scratches for finishing stainless steel and other metals. Expander Wheel has 1/4 in radius to eliminate edge cuts and a 5/8 in arbor hole. For use with 3 in x 10-11/16 in 3M(TM) Coated Abrasive belts and 3M(TM) Surface Conditioning belts. Requires #3 Wheel Adaptor Kit (PN45038) to mount to 3M(TM) Inline Sanders.