1. OEM experience: 30 years 2. Excellent quality 3.Widely used in gardening tools 4. Material: spring steel MaterialSteelScope of applicaionGardening toolsCertificatesISO9001:2000, ISO14001:2004, ISO/TS16949:2009Surface treatmentzinc plating, anti-corrosiveFeaturesGood hardness and long service life, resistent to both high temperature and high pressure