A pulley for cable pulling, also known as a sheave, running block, or roller, is a crucial tool used to guide and support a cable or conductor during a pull. Its primary purpose is twofold: to reduce friction and to change the direction of the pulling force. By guiding the cable along its route, a pulley prevents the cable from dragging on the ground, rubbing against obstacles, or exceeding its minimum bending radius. This significantly reduces the tension required to complete the pull, which in turn reduces stress on both the pulling equipment and the cable itself, protecting the outer jacket from abrasion and internal damage.