The Westgate Mfg RDJ4-TRM-BK is a black magnetic trim accessory for the RDJ4 series 4-inch J-box recessed light, providing a clean finished appearance at the ceiling plane in retrofit and new construction installations. The magnetic attachment mechanism allows tool-free trim removal for maintenance or relamping access. Covered by a 5-year warranty and ETL listed as part of the RDJ4 recessed system.