Mechanical prusik for pruning The ZIGZAG mechanical Prusik makes it possible to move efficiently in the tree, while retaining the movement specific to the classic Prusik pulley system. The blocking chain provides precision and fluidity in movement. The pulley, mounted on sealed ball bearings, allows slack to be taken up easily. Use on doubles rope and singles rope gives it excellent versatility. The lower connection hole is fixed to guarantee the alignment of the device in the axis of the worker and to optimize the grip.