Tell Manufacturing's 600 Series Door Closer is designed for interior commercial use. It is a heavy-duty aluminum commercial door closer that complies with ANSI A156.4, UL/ULC listed up to 3 hour fire rated. The DC100048 has a fixed spring tension, size 4. Same hole pattern as Norton 1600 or YAle 50 seriesFits interior 36 inch door and exterior 30 inch doorDuronodic finish(dark brown metallic)UL listed