1.sofa moved backrest hinges; 2.it can be moved back and forth; 3.the quanlity is very good. 1. Material: zinc alloys2. Finish: Powder coated or electroplating finish 3. Size: As per customer designDetails of stamping part:Material: Iron, carbon steel, stainless steel, aluminum, brass, copper, SPCC, SECC, SGCC, SPHCThickness: As per customer's request.Processing Machines: auto lathes machines, ...