The ISC Compact Rigging Pulley is half the size of the Small Rigging Pulley. It is proof that a product can be small and strong. The pulley is rated at 85kN (19000 lbs) and has a load limit of 17kN (3800lbs). This means the pulley has a tremendous strength-to-weight ration. It is made from hot-forged aluminum and is designed to work with 13mm (1/2") lowering rope and 16mm (5/8") diameter sling.