Total quality control JEIN YEH products are quality guaranteed   After heat treated,JEIN YEH products are subject to test for mechanical properties.Each product will be inspected and tested to meet the rigorous standards before shipment. The test items iuclude:tensile strength,elongation percentage and hardness etc.   NO.2 Yung Hsing Rd., Nan Kung IND. Park, Nantou City, Nantou County, 54067 Taiwan, R.O.C. 04-9225 5658 / FAX: 04-9225 5659