The Norton 1604 Surface Back Check Door Closer offers proven quality, performance and reliability unmatched by the competition. This closer is designed for interior and exterior doors and ideal for any medium traffic commercial application It is Tri-Style, meaning it supplied with screws, a bracket and a soffit plate to allow for regular, top jamb and parallel installation.This door closer allows for adjustment of door speed from the door's full open position to down to approximately 10 degrees from the closed position. The Norton 1604 door closer is suitable for use on fire doors and is supplied with a heavy duty cast aluminium body.