Suitable for full range of ZF 12-speed and 16-speed commercial gearboxes, it is carefully selected with fine materials and exquisite workmanship for superior mechanical properties, outstanding impact resistance and wear resistance. Precision forming process ensures proper matching clearance, low operation noise and low wear to slow down internal part loss. It adapts well to various temperatures for normal operation in all climates with accurate oil pressure control and adjustable braking force, effectively improving driving safety and reducing later replacement and maintenance frequency.