Engineered for speed, efficiency and superior handling. High density, free-spin plain bearing and self-aligning head reduce friction and increase efficiency. Easy to use, patented shackle post lock. Stainless steel straps and glass-fibre reinforced cheeks. Sheave / bearing / pin & line size for optimum efficiency. Description Alum. Footblock w/Jammer Size 60MM Work Load 1760 lb.