HARKEN 100mm Aluminum Double Block — Swivel, 3248 Sailing Shackles & Swivels_Loups Simple design and construction for

Simple design and construction for handling high static loads on cruising boats

Light but durable TPU fabric with fully welded construction

Use a standard low-beam track when the track can be supported at each fastener hole

29 mm blocks feature a one-piece titanium outer race/sheave

Offered in 57 - 150 mm sizes

HARKEN 100mm Aluminum Double Block — Swivel, 3248 Sailing Shackles & Swivels_Loups Simple design and construction forBlack 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. Offered in 57 150 mm sizes, with low load versions in 57 and 75 mm ranges. A center cage keeps Torlon roller bearings separated and parallel to reduce friction. The sheave center carries the primary load,