features: Automatic opening lid stay Automatic version, once you begin to open the door it continues to open gently and completely by itself Refer to chart to calculate quantity of stays required per door. For smaller doors see product codes 30064 and 30065 Useful method: 1) For aligning nearby doors through the rotary knob placed on the piston base plate 2) To change the time in opening and closing of the door by adjusting the position of the piston base plate within the slot of the side bracket Important Information: The door bracket has to be placed in a vertical position with the slot facing forwards. The side bracket has to be placed with the slot in a horizontal position and the open end facing the wall. The opening and closing of the door can be changed by adjusting the position of the piston base plate within the slot: Forwards adjustment = the door opens later Backwards adjustment = the door closes later. Metal supports for quick assembly Fixing screws and guide included Nickel-plated zinc alloy