... diameter from 0.1mm-10mm.2). Material: carbon spring steel, alloy spring steel, stainless spring steel, etc.3). Finish: black oxide ... to both high and low quality.6). My company is a Sino-America joint venture,with YPAYMORE/ROGER ABRAHAM in the ... ,Australia and India.Products:various kinds of compression spiral spring,extension spring,torsion spring,calipers spring,disc spring.It also produces ...