1/2 Inch x 1 Inch Rubber Mandrel with 1/4 Inch Shank

The 1/2-inch x 1-inch rubber drum mounts the Trizact finishing bands. The band slips over the rubber drum, and you tighten the nut at the bottom to "lock" the band in place on the drum. 

The 1/4-inch shank fits most accessories, making finishing hard-to-reach areas fast and easy.