This jammer block is for situations where a fixed foot block can’t help: peeling spinnakers, or changing a sheet winch. Perfect multifunctional utility block. Controlled spinnaker handling Attached with webbing strop, positioned on a toe rail or padeye No drilling and no clutter on deck Plain bearing sheave provides smooth running at low loads Excellent durability at high loads Strop allows fullest rotation for spinnaker sheet use CAM has three distinct operating modes Sheave Diameter / Type BRS/50 - 50mm (2") composite SWL Sheave BRS/50 - 800kg (1760lbs) Safe Cam Load BRS/50 - 160kg (352lbs) Line Diameter BRS/50 - 6-10mm (1/4-3/8")