The Norton 7500 Heavy Duty Surface DA Closer is a robust multi sized surface door closer designed to deliver superior performance and long term reliability. Ideal for interior and exterior doors in facilities that demand reliability such as government, healthcare and educational institutions. 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 7500 door closer features a delay action function and is supplied with a molded plastic cover. It is certified for inswing and outswing single and double door assemblies to ICC storm shelters.