These rugged and lightweight corner blocks are used to guide cable and evenly distribute the load on the cable when pulling around corners. Welded and painted steel frames. New and improved plastic roller now allows you to pull with poly rope. Accepts up to a 1 3/8 in. diameter cable or innerduct on a 23 in. bending radius. Cable retaining roller helps prevent the cable from jumping off of the rollers. Mounts on Ratcheting Pole Bracket (P/N 70372).