216ICUS19 Finish: Black E-Coat Features: -Matl. Thickness of 1-3/8", 1 each.-Allen wrench after installation.-Installation can be either inside the door itself or inside the door jamb.-Ideally suited for all types of doors 1 3/8" thick or more.-Closure rate is completely adjustable.-Allow one spring closer for each 75 lbs.-Does not require removal of the spring closer.-Recommended spacing is one half of the distance from the center of the door to the center of the top hinge.-Door weight for all spring closers.