... dia.: 0.08mm -- 10.0mm 3.Free Sample is available Door extension/tension spring Feature:1.Spec: wire dia. Range: 0 ... ,long service life,good quality.6.Usage: Widely used on hardware,auomobile,machine,toy,furniture,apparatus,electrical equipmen,tfitness equipment,meter ... spring,compression spring,torsion spring ect.We also good provide hardware.If anything can help you ,pls let me know,tks ...