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The roots of the furniture legs are designed of ball shape to roll,and they can drive the legs realize the change of gradients.When the leg's gradient changes,the height of this set of furniture changes too,in that case it achieve the objective of height adjustment.Aiming to make sure the stability of the legs,there is an metal ring which playing the role of fixation and can be inserted the grooves in the legs.The back of a chair joint with the chair by two metal sticks.There are several grooves used for fasten.The back can move to different heights when you push those two metal sticks gently towards the center of them.