The Union 7770 door closer is a medium duty door closer suitable for use on doors between 850mm and 1100mm wide. It has 3 different power sizes thereby maximizing on costs with the force setting being altered by selecting position of closer on the door. This closer is has a cast aluminium body, a steel arm passivated against rust and high quality steel internal components. It also has heat treated steel rack & pinion immersed in high grade oil operation and nest of coils to give a smooth, precise action and minimum wear