Covington Expandable Drum Unit Abrasive Disc Heavy duty ball bearings Option:Perfect Diamond Glass 10" Heavy duty ball bearings The 4 1 2" x 1 2" aluminum head has a 3 8" recessed ring in the ceiling which provides a trough for the beads to follow this new unit has two drums mounted on a shaft that is pulley driven This unit still runs at 1725rpm
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