Carlon B125AB is a versatile non-metallic electrical box designed for both single-gang and two-gang applications. It features captive nails and screw guides for simple and secure mounting, a break-off flange for new or old work, and a large capacity to accommodate various devices, including dimmers and larger switches. The box is suitable for use with wood or steel studs, and can be mounted horizontally or vertically. It also has internal screw guides and mounts to change the depth of installation.