Commercial door closer Heavy duty Meets ANSI Grade 1 security standards Adjustable delayed action preset at the factory for approximately 20 seconds between 70 and 120 barrier free reduced spring power for handicapped or elderly Top jam or parallel arm installation Adjustable closing latching speed by two separate regulating valves Rack and pinion mechanism contained in high tensile precision housing Surface mount installation For 33 lb to 187 lb door weight 9-1/16" x 3/4" hole centers Length: 11.5Width: 3.5Height: 3.75