This is a Hold Open Parallel Arm Bracket / Mounting Plate.
It is used in the parallel arm mounting process with a Friction Type Hold Open Arm.
This bracket can be used with any surface mounted closer where the arm Shoe has a 2-1/2\'' center to center hole pattern.
Width at Header Mount: 3-3/8\''
Shoe Mount Holes: 2-1/2\'' center to center
3/16\'' Thick Steel