SRAM PG-720 / GX DH 7-speed cassette spacer and spoke guard. This is the plastic spacer/guard used with the SRAM PG-720 7-speed downhill cassette, 11-25T. It is used when fitting the narrow 7-speed DH cassette to a standard HG-style freehub body, and also acts as an inboard spoke/chain-drop guard behind the cassette.
