We are a large scale spring manufacturer 1) Including Single Torsion Springs,Dual Torsion Spring 2) The Torsion Spring used in car redirector and steering wheel 1) High service-life Torsion Springs have good hardness and resistance to both high and low temperatures.2) Manufactured by fully automatic springs making machines,the cost is very low3) Go thorugh TS16949,ISO14001,OHSAS180014) OEM