Sheave Diameter / Type
BRS/50 - 50mm (2") composite
BRS/63 - 63mm (2 1/2") alloy
SWL Sheave
BRS/50 - 800kg (1760lbs)
BRS/63 - 1200kg (2640lbs)
Safe Cam Load
BRS/50 - 160kg (352lbs)
BRS/63 - 240kg (528lbs)
Line Diameter
BRS/50 - 6-10mm (1/4-3/8")
BRS/63 - 8-12mm (5/16-1/2)
Weight
BRS/50 - 250g (8.8oz)
BRS/63 - 365g (12.8oz)
Fasteners
Soft fastening (attached)
This jammer block is for situations where a fixed foot block can’t help: peeling spinnakers, or changing a sheet winch