CMI set the standard for lightweight, compact, and functional rescue pulleys almost 15 years ago. This double pulley with becket can be fashioned together with other pulleys to give you huge mechanical advantages. These pulleys feature stainless steel axles and the aluminum sheaves are supported by sintered bronze bushings. The stainless steel cheeks feature the "wide skirt" sideplate design for maximum rope protection. Sideplates swing open to allow placement anywhere on the line. Accepts ropes up to 5/8" in diameter.