High quality material: Self-closing door springs are made of high quality carbon steel with a black protective coating to prevent or reduce element damage, rust and wear to ensure extra protection. Gate spring closer: This automatic door closing device helps keep your property safe by always closing the door after use. the strong metal spring can slowly close the door without any noise, easy to use and easy application. Adjustable spring tension: This heavy duty gate spring is very easy to install, attach the spring gate closer on one side to the gate with the provided screws, screw the other side to the post, adjust the spring tension with the adjustment pin, and finally secure the spring with the locating pin. Can be used for left and right door opening. Easy to install: This heavy duty door spring is very easy to install, All you have to do is fix one side of the door spring to the door with the provided screws, screw the other side to the post, adjust the spring tension with the adjustment pin, and finally secure the spring with the locating pin. Can be used for left and right door opening. Wide application: This exterior door closer is ideal for front doors, gates, farm fences, garden fences and all kinds of left and right wooden door springs. Widely used in home, indoors and outdoors.