RP055A 3/4″ Medium Blue Spring Pin Block w/ Captive Pin and Bushing These heavy duty rigging blocks combine the convenience of a spring loaded upper pin with a captive bushing and light-weight design. Stainless steel sheave and bushing pins with an epoxy polyester coating over aluminum make up the construction of these quality rigging blocks. Features and specifications: Capacity: 3/4″ Diameter Rope Tensile Strength: 22,500 lbs. Pulley Height: 8.75″ Pulley Width: 5.00″ Weight: 5.25 lbs. Manufacture: ISC