RP131 Heavy Duty Steel Steel Rigging Block Removeable Pin w/ Bushing. Features and specifications: Stainless Steel Cheek Plates and Steel Sheave. Moveable cheek plates for easy insertion anywhere in a line. Removeable pin with sling bushing. Capacity: 3/4″ Diameter Rope Tensile Strength: 40,000 lbs. Sheave Diameter: 4.00″ Pulley Height: 7.00″ Pulley Width: 5.00″ Weight: 5.60 lbs. Manufacture: CMI