The Powerline by Body-Solid PPR500EXT Power Rack Extension is an optional attachment for the PPR500 Half Rack. The extension expands the back of the PPR500 Half Rack creating an ideal spot for weight horns (PPRWH), u-links (PPRUL) and several other Powerline by Body-Solid rack attachments. The Powerline by Body-Solid PPR500EXT Rack Extension also makes it easier for spotter access and opens up new workout options and possibilities.