Hold open dwell allows door to remain open at 90? for ease of product stocking. Cushioned stop is employed at 115? to absorb shock, eliminate damage to frame, door and adjacent equipment. Self-closing, non-rise spring actuated cam. Self-lubricating for smooth and silent operation. Reversible application allows cartridge assembly can be used for left or right hand doors. Overclose design assures constant door pressure for full gasket seal. Die Cast zamak case. Chrome plated finish (Black epoxy powder coated available). Upper Cam is Die Cast Zamak. Nylon lower cam and Pivot guide. Spring is compression type silicone wire.