CRL Jackson Overhead Concealed Door Closer Bodies feature dual valves to control closing and latching speeds. 90º and 105º Hold Open and No Hold Open models are available in fixed and adjustable spring sizes. Closer Bodies fit into standard 1-3/4" x 4" or larger, header extrusions. These closer bodies will retrofit existing Jackson body style closers. Mounting clips are not included with this closer body. Unless the existing mounting clips are used, you will need to purchase the appropriate clip package for your application. Contact Jackson Technical Sales Department for assistance in selecting the correct mounting clip package.