Harken 29mm and 40mm soft-attach Fly blocks have a titanium sheave with stainless steel ball bearings and inner race on a composite fibre-reinforced body.

We use the blocks for spinnaker halyards, boom vang cascades and other high load applications where a metal sheave is important to prevent a line from burning or breaking a plastic sheave.

Fly blocks need to be lashed on.

See more information on the Harken website.