The Medium Length Standard Aluminum Extension US Base comes with a sleek Six Pin adjusting collar and anodized logo/index markings which are some of the unique and innovative features that make Chinook extensions the most popular extensions on the market. It comes standard with the proven top of the line US Power-Haul pulley and cleat system that allows a 2 cm adjustment option. This extension can add a maximum 28cm to your mast length.
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