Standard: DIN, GB, ASME, ANSI, Non-standard
Material: Spring steel,Carbon steel, Stainless steel,brass,copper
eatures:1)Standard: DIN137,GB860,ANSI/ASTM,BS,JIS,Non-standard2)Material: Spring steel 65Mn,Carbon steel, stainless steel(A2,A4),brass,copper3)Metric...