... fully automatic production 2. Professional service team heavy load 316 stainless steel compression springFeatures of 316 stainless steel ... alloy spring steel, refractory steel, brass, bronze, etc Load type compressionFinish Zinc-plated, nickel-plated, chrome-plated, silver ... C,WULead-time15 daysPackaging Inner plastic bag, outer carton box, and advised by customer.Certification ISO9001:2008 ,ISO14001and ...