4 in. 21 Cu. in. Square Box Extension Ring (531511234-20R)

This 2-Gang 1-1/2 in. Square Box Ring features 8 knockouts which are sized 1/2 in. and 3/4 in. It is made of metallic materials for durability. Designed for indoor use. Less labor required to install 3/4 conduit to box. Material: Steel.