The original and still the most popular Harken block. They are compact, good looking, and exceptionally free running with a high load carrying capacity. Used for main & jib sheets on course racing keel boats, scows and dinghies with large mains. Often used for spinnaker halyards & sheets on small offshore boats.
Single block
Sheave diameter 2 1/4"
Length 4 1/4"
Max. line diameter 7/16"
Shackle pin diameter 3/16"
SWL 500#
Breaking strength 2500