2-1/2 in deep, six gang Multi-Gang Boxes with 3/4 in and 1 in conduit knockouts are used when multiple electrical or low voltage devices must be mounted in one location. Their 3/4 in and 1 in concentric knockouts allow for large wire capacity. They can also be used as large capacity junction boxes. Garvin Industries gang boxes save time in installation because there is no need to gang boxes together.