... . 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- ... team.2. Complete first-class fully automatic production and testing equipment, careful safe package and prompt delivery. 3. ...