This regular arm or standard arm closer is a pull-side application, meaning it is located on the exterior of the door. In these applications, there are two arms, one attached to the frame and another to a spring-loaded box on the pull-side of the door. The arms, when closed, project out perpendicularly from the door. It’s an overhead type of door closer. Power adjustable hydraulic door closer, size 2-4. Widely used in offices, conference rooms and commercial properties. Can be used in both interior and exterior doors within a premise.