HARKEN 125 mm Aluminum Black Magic Block - Swivel, 3256 Tracks & Accessories_End controls It is used for main

It is used for main and jib sheets on course racing keelboats

self-lubricating slotted bushing bearings do not deform - providing smooth

They keep the block aligned correctly by pushing the lashing line to the outer edges of the block's head

with Grade 316 plunger and pin for high strength-to-weight ratio

but martensitic in the hardened condition

HARKEN 125 mm Aluminum Black Magic Block - Swivel, 3256 Tracks & Accessories_End controls It is used for mainBlack 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. The sheave center carries the primary load, allowing a smaller, lighter weight block. The soft attachment Loop block has a