A roller for cable pulling, also known as a cable sheave or running block, is a tool with a free-running wheel used to support and guide cables during installation. Its primary function is to significantly reduce friction between the cable and the ground, trench, or conduit. By minimizing friction, rollers lower the pulling tension required, which in turn prevents damage to the cable's outer sheath and internal conductors. Using the correct rollers is a non-negotiable step for any professional cable installation, as it ensures a smooth, safe, and efficient pull while protecting your expensive cable assets.