HARKEN 29mm Fly™ Block, 2171 Steering_Tillers & Tiller Extensions Head shackles are stamped stainless

Head shackles are stamped stainless steel with a clevis pin and cotter ring

Commonly 75mm blocks are for mainsheet and asymmetric spinnaker sheet trim on larger keelboats

This powerful configuration prevents sheets from crossing and chafing and distributes load to three axles instead of the two seen in other block designs

decreasing the loads on the side plates and acting as a safety backup for the system

sport boats

HARKEN 29mm Fly™ Block, 2171 Steering_Tillers & Tiller Extensions Head shackles are stamped stainlessHarken soft attach Fly blocks are designed to provide strength without mass, providing sailors with big power in a low aero package. Designed specifically for high tech lines, these efficient blocks have an incredible working load for their small size. Fly blocks are perfect for use on foiling dinghies and sportboats and for Vang cascades and backstay systems on Grand Prix racers. 29 mm blocks feature a one piece titanium outer race sheave, stainless