Gravity Coordinators are non-handed and when the active door is open, coordinator prevents active door from closing until inactive door bypasses. Closing of inactive door causes strike plate on top of door to contact cam and lift arm, allowing active door to close. As inactive door continues closing, roller rides over strike plate on the door bracket, holding arm above active door. COR7G for use on pairs of doors with astragal on active door up to 4' or with astragal on inactive door up to 3'4" or with astragal on both doors up to 2'10". COR9G for use on pairs of doors with astragal on active door over 4' or with astragal on inactive door over 3'4" or with astragal on both doors over 2'10