Harken 40 mm Double Block Halyard They have a spring loaded

They have a spring loaded mechanism that positively locks the pin in either the open or closed position

resulting in fast and smooth running for rope around the sheave

Swivel Head‚ Featuring a 360-degree swivel head with a 4mm shackle

The Rig Gauge PRO comes complete with a padded bag to keep it safe from damage when its in your rig bag or tool box

Perfect for Wayfarer sailing dinghies

Harken 40 mm Double Block Halyard They have a spring loaded40 mm Double Block Low friction Carbo Air blocks are lightweight, strong, reliable and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.