Harken 57mm Ratchet Block — Swivel, Red Sheave 747 Fly blocks are perfect for

Fly blocks are perfect for use on foiling dinghies and sportboats and for vang cascades and backstay systems on Grand-Prix racers

T2 doubles feature composite line guides that are integrated into the block head

Pressure on the line engages the ratchet mechanism

10:1 holding power

Length (in)2 7/8 in

Harken 57mm Ratchet Block — Swivel, Red Sheave 747 Fly blocks are perfect forSheave (mm)57 mm Sheave (in)2 1 4 in Maximum line (mm)10 mm Maximum line (in)3 8 in Maximum working load (kg)227 kg Maximum working load (lb)500 lb Carbo Ratchets allow sailors to hand hold loaded lines and offer balance between holding power and controlled easing. Part No. 2135. RED