For use with FSR's FL-400 back boxes, the FL-400-PTBK-C high-quality floor box cover has a unique tool-less Flat Piano Hinge in painted black. The smaller hinged cable exit door flips back to allow the cover to remain in place after connections and cables are routed through it. The 0.25" and 0.5" raised edge style and solid covers are UL scrub water approved.