Harken 29mm Triple Carbo Air Block w/Swivel

The Harken 29mm Triple Carbo Air Block with Swivel is a purpose-built rigging solution designed for cruising sailors, racing crews, and serious boaters who demand reliable performance under load. Built by Harken, a name synonymous with marine hardware excellence, this block excels in mainsheet, jib sheet, and control line applications where smooth operation and durability are non-negotiable.

At 29mm diameter, this block's triple-sheave design multiplies your pulling power while the Carbo Air construction keeps weight minimal—critical for high-aspect sails where every gram affects boat balance and response. The integrated swivel eliminates twist in your control lines, preventing kinks and ensuring consistent lead angles whether you're pointing tight to windward or running downwind in a seaway.

Harken's engineering means the sheaves roll freely under sustained load, reducing hand fatigue during long days on the water and extending the life of your cordage by minimizing friction-induced wear. This block suits any sailor running modern control line systems or upgrading aging hardware that no longer performs reliably. Installation is straightforward, and the compact design fits standard deck and boom mounting points.