... steel 2.Wire Dia.:0.01mm-10mm 3.ISO9001 certificate Compression spring We are one of professional spring manufacuture. We can ... kinds of springs in comepetitive prices with high quality. Spring, compression spring, extension spring, torsion spring, flat spring, wire form, hay ... -50 HRCFinish treatmentPlating / PaintingPackageexport carton2. Production Process: 3.Product Image: Compression spring