Compression Spring made of various material with different finish; Made in ... 01 to 20mm;Raw material: stainless steel, carbon steel, spring steel, alloy spring steel, refractory steel, high temperature resisting alloy, corrosion- ... plated, gold-plated, and imitation gold-platedHigh-tech equipments: Advanced CNC spring machinery imported from Japan, Germany, Sweden, and TaiwanAdvanced grinding and ...