... Name:Yuanwangxing3Style:Spiral/Flat/Coil/Abnromity springs, stamping/lathe processing hardware4Load Type:Compression/Torsion/Extension/Abnormity springss5Min. ... ,spectrum analyzer device imported from Germany,vacuum melting furnace,CNC machine center17Production euipment:devise industrial,auto, motorcycle, electronics, ... inside diameter(5) Number of coils(6) Qty CNC Custom Lathe processing bolt