Automatic Door Closer Commercial or Residential, Heavy Duty Door Closer Hydraulic with 1-6 Adjustable Spring Size for Door Weights up to 330LBS, Surface-Mounted Door Closing Mechanism. 11.7"L x 3.3"W x 2.2H. Commercial buildings, high-traffic areas, exterior entrances, interior doors, adjustable for various door weights and sizes, suitable for different commercial door types. Our IRONWALLS medium/heavy-duty commercial door closer is ANSI Grade 1 certified and has surpassed over 2 million door cycles in testing. Moreover, our door closer features fully adjustable spring sizes, ...