When using a planer board mast system, this pulley slides onto the line allowing for retrieval. This is an ideal safe way to add more clips to the planer board line. Pulleys can also be used on downriggers for retrieving the cannonball from water surface to boat. Molded from Lexan, with all stainless steel hardware, these pulleys will offer you a lifetime of service. Includes one pulley, one cleat, 15" coil of rope.