Harken 57mm Aluminum Double Block — Swivel RHKYC-Branded Sailing Clothing Tube Ø (in)5/8 in

Tube Ø (in)5/8 in

Breaking load (kg)1500 kg

Can be used as becket block

Base Ø (in)4

Quantity25

Harken 57mm Aluminum Double Block — Swivel RHKYC-Branded Sailing Clothing Tube Ø (in)5/8 inPart No. 3217 Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting. Torlon is a registered trademark of