1,JH Series winches are used spherical worm drive. 2,JD Series winches are used planetary gear drive winch with a compact. 1,JH Series winches are used spherical worm drive, a compact structure, small size, can go down machine; winch structure of symmetrical arrangement, an elongated strip, the base was sledge-like, so smooth in the underground since the shift flexible; winch low center of ...