Arlington FER102C Center Section for FER102, Expands Outlet Box by 1-Gang, 10-Pack Includes 10 center section units - each adds (1) gang to FER102 gangable boxes No tools are required to install the center sections, simply snap units together Adjustments are easy - just slip screw driver in between sections and twist to remove, save on time and money Multiple center sections may be used together when a larger box is needed, for up to a 10-gang box Intended for use with the Arlington FER102 two gang boxes with Mounting Wing screws for existing construction