5100 Series Door Closers are heavy duty, constructed of cast iron to be installed on exterior and interior doors that are subject to high use and potential abuse. They have a full rack and pinion operation, with a heat treated steel piston and triple heat treated steel spindle.
This Grade 2 Heavy Duty Overhead Door Holder is ideal for office buildings and other standard duty commercial applications. For concealed mount on exterior and interior single acting doors. Adjustable arms provide easy installation. Slide track design.