Support rail folds up against wall when not in use. Larger-diameter rail provides a secure grip. Rail attaches to a plate that is fixed to the wall. Spring mechanism reduces effort required to lower and raise rail and holds rail up securely out of the way when not needed. Epoxy-coated steel tube has been treated against corrosion. Supports up to 210lbs. (95kg). Professional installation recommended. 1.25" (3.2cm) diameter x 30" (76cm) long.