The CloserPlus Arm is intended for use where an auxiliary door stop cannot be utilized and no more than moderate abuse is anticipated. Where more extreme conditions are expected, use of a Unitrol arm is recommended. Similar to the Parallel Rigid arm, this arm incorporates a stop at the arm’s soffit plate to dead stop the door at a predetermined degree of door swing between 85° to 110°, in 5° increments. Prior to dead stop the door closer’s backcheck feature slows the door speed to reduce the impact of the stop action.