Here is a CRL PR90 Grade 1 adjustable spring power size 1 to 6 cast iron dark bronze surface mount door closer. CRL cast iron door closers have long been considered the industry's most durable. This surface-mounted door closer is recommended for high traffic public buildings such as hospitals, airports, and shopping centers and meets both A.D.A. accessibility requirements and provides durability and maintenance-free service. Closing and latching speed controls are independently adjustable and an adjustable back-check feature helps prevent damage to the closer, door, and adjacent surface should the door be violently swung open due to wind or heavy pedestrian traffic.