... Nice after-sale service Detailed Description:1. Material: Stainless Steel, High Carbon Steel, Galvanized Steel, Hard Drawn, Non-ferrous Metals etc.2. ... confirmation and then put into production Business Type:ManufacturerMain Products:steel ball, spring, screw, stamping part, Automatic lathes ... certificated ,and looking forward to cooperate with you ! stainless steel hollow custom spring