Petzl TWIN High Efficiency High Strength Double Prusik Pulley P65ATWIN is a high strength double pulley designed for rescue professionals. It is designed to set up progress capture systems of high mechanical advantage. Special side plates designed for use with a Prusik friction hitch in progress capture systems Parallel mounted sheaves and auxiliary attachment point for creating different types of hauling systems, including the most complex Large diameter sheaves mounted on sealed ball bearings for excellent