Easier to carry in your life jacket pocket or swiftwater rescue kit than other, heavier pulleys.The pulley works great in Z-drag 3-to-1 extraction systems, rated at an amazing 22kN (4,946 lbf) load strength.High-strength aluminum sides keep it light while a stainless steel axle resists corrosion.Also features a durable and smooth-running Delrin® sheave.This pulley has the required prusik-minding capability for use in 3-to-1 mechanical advantage systems, making it easier to haul or lower heavy loads