The ACE Swivel Rope Pulley 1-1/2in (3.81cm) Zinc Plated is a tool designed for both indoor and outdoor applications. It features a heavy-duty single sheave and a swivel eye to prevent tangling. The zinc plating provides excellent resistance to rust and corrosion. This pulley is suitable for ropes up to 3/8" or 1/2" and has a safe working load of up to 420 lbs.