'J-O' Type Offset Arm Mortise Mount Type
For 7/8" (22 mm) Depth Top Rail

This J-O arm assembly is intended for use with overhead concealed door closers. The assembly includes a slide-track, offset arm and all mounting hardware. The slide-track requires a minimum depth top rail of 7/8" (22 mm) for surface mounting or is mortised into the door to obtain proper rail depth.