HARKEN 125 mm Aluminum Black Magic Block - Swivel, 3256 Tracks & Accessories_End controls They keep the block aligned

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

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

but martensitic in the hardened condition

Ratchet engagement may be adjusted to a higher or lower load according to strength and sailing style

cunningham

HARKEN 125 mm Aluminum Black Magic Block - Swivel, 3256 Tracks & Accessories_End controls They keep the block alignedBlack 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