auto close hinge,Multifunctional hinge,3-in-1 door closer hinge.Easy opening and closing,shock absorbing. auto close hinge1. ... aluminum, high quality steel or stainless steel, advanced hydraulic oil (pour point -45 degrees, flash point ... as well3 easy installations1) No difference from normal hinge installation, simplicity, flexibility, easy operation.2) ... adjusting the bottom screws. auto close hinge