RKS Universal 4 ft. x 4 ft. Fluorescent Conversion Magnetic Fixture Retrofit Kit. Easily converts most all your existing residential and commercial 4-foot, T8 and T12 linear and U-Bent, fluorescent light fixtures into an integrated LED light fixture. It can easy be custom sized to fit applications from 4-foot to 8-foot. This retrofit kit works with the earliest to the latest versions of ceiling mount, two-foot fluorescent light fixtures, regardless of the style, manufacturer or existing ballast type including linear high bay, strip or wrap fixtures and even chain suspended shop lights. Since the retrofit kit contains the LED driver, there is no guess work to determine if it is compatible with your existing fixtures’ magnetic or electronic ballast. Super simple installation in 3 easy steps: 1). Remove existing bulbs and ballast. 2). Attach magnetically backed driver and connect to AC power source. 3). Attach magnetically backed LED strips and quick connect to Y-harness. If your fixture isn't steel, no worries, the kit is pre-drilled and comes with mounting screws. The fixture is DLC listed to qualify for commercial lighting rebates and special incentives in certain regional areas.