These are often attached under the area to be cut with an eye sling. It acts as a false crotch using rigging lines and a friction device to lower cut material. 28,000 lb tensile, 2,800 lb working load. It has an aluminum wheel with a bushing axle (2-1/2 inch thread dia.) and stainless steel side plates. 5/8 inch max rope dia. and weighs 2.3 lbs.