Fully enclosed spring-loaded cam latches allow years of hassle-free maintenance; Mitered corners provide clean, crisp appearance with no visible rivets or screws; Heavy-gauge welded end plates and housing ensure durable, rigid construction; Fully gasketed door minimizes contaminants; High-performance up to 135 lm/W; Flat or regress door frame options in steel or aluminum; Six standard finish options and a wide selection of custom colors complement the architectural elements of any space; 2' and 4' lengths available; Buy American Act compliant; Available with Avi-on wireless fixture controls; Made Right Here in the USA