Harken 57mm Aluminum Low-Load Block — Swivel 3226 MEDIUM KEEL BOAT 57/60mm The medium loft fleece lining

The medium loft fleece lining adds additional warmth to the core of the body

NO COMPROMISE ON WATERPROOFNESSContinuous and lasting waterproofness of 24

Head posts can be locked at 0 or 90 degrees

It can do deep bubble free castings

Tested to withhold over 500kgs

Harken 57mm Aluminum Low-Load Block — Swivel 3226 MEDIUM KEEL BOAT 57/60mm The medium loft fleece liningBlack 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. Low load blocks have red isolators. They use