Wright Products, Aluminum, heavy-duty pneumatic (air pressure) door closer is designed for out-swinging medium-to-heavy weight storm, or security doors. Door closer measures 12-1/4” long (unextended, center hole to center hole), with a tube length of 10-1/2" and a diameter of 1-1/2”, Easy-to-use thumbscrew dial that requires no tools to increase or decrease the closing speed or force, Fully lubricated spring stretches to allow the door to open a full 90 degrees before it pulls the door closed at a controlled pace. By using air within the pneumatic tube to cushion the force of the door, it prevents it from slamming and preserves the life of the closer, the door and the door frame, Effortlessly adjust the hold-open washer to keep the door open to desired position, All installation hardware is included, no additional parts need to be ordered or added; comes with seasonal latching adjustment option on the jamb bracket to switch between a glass or screen insert.