Mechanical Prusik for Arborists Description The PETZL Zigzag is a versatile piece of equipment designed specifically for arborists. It functions as a mechanical prusik and incorporates a pulley for use moving around the tree in the classic Prusik pulley system technique. The unique action of the device combined with a ball bearing mounted pulley and built in swivel pulley gives the user the ability to position themselves precisely and efficiently in the tree. Technical Features Precise control in ascent or descent Durable steel construction Built in swivel Only for use on double ropes Working load limit 140 kg Rope diameter 11.5-13 mm Rope compatibility EN 1891 type A semi-static rope Weight 320 g Video Downloads Please refer to the Petzl Zigzag Instructions sheet for more information.