1. High transmission ability, high torque, easy to control.
2. Less parts, easy to assembly.
3. All metallogy capably use in lower, higher temperature or in dusty enviroment.
4. No friction, no noise.
1. CP67: (1) A: 67. (2) B: 33. (3) L: 57.
2. CP81: (1) A: 81. (2) B: 46. (3) L: 58.
3. CP93: (1) A: 93. (2) B: 51. (3) L: 66.