... hinge,3-in-1 door closer hinge.Easy opening and closing,shock absorbing.Closing speed can be adjusted. 3-in-1 door closer hinge 1. ... life, (50 million or more circles)1)special-made aluminum, high quality steel or stainless steel, advanced hydraulic oil ... processing technology ensure first-class quality.3), for the parts from producing to finishing, high-precision testing equipments used, after ...