In-Factory Production Allows continuous technical developments, maintains a high-quality level Premium Material Selection: ONLY use 20CrMo steel for cylinders, and other major components, all under the close quality test. Precision Manufacture: Essential Components are Manufactured by Computerized Automatic Machinery from Korea (Doosan CNC Machineries) Ensure Major Components Standardized Tolerance and Clearance. Heat Treatment: Major Components are all under heat treatment by our own facilities in our factories Before Delivery Test: All breakers are tested according to the ISO quality control system before delivery