4 , screw thread gob produced by internation standard , material is 38chrome molybdenum aluminium azote steel , high rigidity , long time.
四螺纹口按国际标准化制造，材料选用38铬钼铝氮化钢，硬度高，使用寿命长。
Our competent quality inspectors employ advanced testing equipments and comprehensive methods to keep the products strictly under control so as to ensure they meet internation standard.
公司产品质量由技术全面的质检人员，通过先进的检测仪器和完备的检测手段进行监控，使其完全符合国际标准。
Our competent quality inspectors employ advanced testing equipments and comprehensive methods to keep the products strictly under control so as to ensure they meet internation standard.
公司产品质量由技术全面的质检人员，通过先进的检测仪器和完备的检测手段进行监控，使其完全符合国际标准。
应用推荐