SL2B18 Adjustable Sliderbar Box Kit, 2-Gang, Steel/Non-Metallic

Adjustable Sliderbar Box Kit, Includes: (1) SL18 SliderBar 10.500 - 17 Inch Adjustable Length, (1) SLB102 2-Gang Non-Metallic Box With Installation Screws and Slider Clip

Here's the easy, NEAT way to mount a single or two-gang box between wood or metal studs with non-standard spacing. It's adjustable to fit between studs spaced 12 to 24 inches apart, depending on SliderBar used, and allows you to position one or multiple boxes where you need them in the stud cavity.