【SPRING HINGE】High tenacity spring connection piece, durable and sturdy. 【Silently Close】 High quality mechanism slowly pulls the door closed for silent movement. 【Cabinet Panel】Works for door thicknesses from 16 to 40 mm. Can adjust the opening angle of 130-170 degrees by adjusting the screw. 【Widely Use】This spring hinge can be widely used to fold the sofa, bed, lift the furniture door, etc. 【Cupboard Hinge】High-strength carbon steel hinges have good anti-rust function and strong load-bearing capacity.