#4 Commercial door closer in a bronze finish. Closing and latching speeds are controlled by separate regulating valves. Universal application. Non-handed for standard, top jamb or parallel arm installation. Rack and pinion mechanisms are contained in a high tensile precision cast aluminum housing assuring the highest quality. Stable hydraulic door check fluid for any climatic operation and constant lubrication. Narrow design permits installation on most modern glass and aluminum doors without adapters. The #4 door closer is recommended for 42" or 48" interior doors, 36" or 42" swing out exterior doors, and 32" or 36" swing in exterior doors. Note: Doors of unusual height or weight, or doors subject to severe wind or draft condition or abusive usage, require the next larger model door closer.