Sargent 351 SeriesSelf sticking templates supplied for most applications Adjustable spring power allows a size range of 1 through 6. Non handed One door closer body for all applications High impact non corrosive plastic covers with two machine screws standard All weather fluid 1 1 2" diameter piston Standard pressure relief valves for both opening and closing cycles Heat treated full closed rack and pinion construction Heavy duty one piece die cast aluminum silicon