We are specialized in all various kinds of torsion springs:  

1). Wire diameter from 0.2mm-75mm.

2). Material: carbon spring steel, alloy spring steel, stainless spring steel, etc.

3). Finish: black oxide, zinc/nickel/chrome plating, power coating, passivate, oiled to prevent rust, and so on.

4). High good quality and long service-life.

5). Good hardness and resistance to both high and low quality.