This square metal support bar is used to stabilize fixed panel shower screens  by securing back to a perpendicular wall or to non adjoining parallel shower wall.   The support arm pivots above the panel connection providing the installer with infinite angle possibilities for securing the panel to a fixed surface.  

The support arm assembly includes a mounting bracket necessary for securing the support bar at the wall as well as adapters for both clamping to frameless glass shower screens and to Gridscape framed glass shower screens.