Low-friction Harken Carbo Air blocks are lightweight, strong, and reliably affordable, and the 40mm Twing Block adapts that construction specifically for spinnaker sheet and guy control up-down duty on dinghies, sport boats, and small keelboats.
An opening side plate makes it easy to rig or remove from a sheet without threading the whole line through, and a spring biases the plate to open once unlatched for genuinely one-handed operation. A roller at the pivot base supports 1:1 or 2:1 up-down control.
It’s also a solid pick for code zero sheet up-down control, and it’s rated to a 606-lb maximum working load with an 1,818-lb breaking load. Check out the rest of our sailing hardware.
- Opening side plate for easy rigging and removal
- Spring-biased for one-handed operation
- Roller at pivot base supports 1:1 or 2:1 control
- Rated to a 606-lb maximum working load
