This AX3R bolt-on steel post bracket adaps the standard rear post brackets that are included in a Ghost Controls gate opener kit to allow installation on 3" diameter round steel posts. These AX3R brackets bolt onto the steel post and then the Ghost Controls rear post bracket (included in automatic gate opener kits) bolt onto these AX3R brackets. No welding is required. Includes all required mounting hardware to bolt these AX3R brackets to the rear post mounting brackets. Single gate opener kits require one AX3R for use on 3 inch round steel posts.. Dual gate opener kits require two AX3R for use on 3 inch round steel posts.