This overhead concealed closer features a longer spindle approximately 3/4" (19 mm), the preferred length when used in conjunction with patch fittings and Herculite door rails. The closer has dual action valves for closing operation (one valve for closing, one valve for latching). 90º and 105º Hold Open and Non-Hold Open adjustable models are available. Interchangeable with International, Jackson® and similar brands of overhead concealed closers. Mounting clips and instructions are included with each door closer body.