1. Standardization of internal threads at rod ends 2. The operability of the magnetic switch is improved and the position is easy to adjust. 3. A screw hole type without trunnion for installation is added to the basic model. 4. The models of rod end mounting parts and swing base mounting parts are set (saving time of ordering cylinders and mounting parts separately) 5. With magnetic switch (CDG1-Z series: CDG1, CDG1W, CDG1K, CDG1KW, CDG1R, CDG1KR, CDBG1)