The Chinook Carbon Mast Extensions are the most popular carbon mast extensions in the US. And for good reason, they are well built and a good value. The added benefit to carbon is they don't corrode and they are lighter weight. Plus they are made in the USA!
32cm maximum extension
2cm increment adjustment
10cm minimum extension. This is very important to note if your sail does not have an adjustable top. So for example, if your sail's luff length is 430cm and your mast is 430 then you're going have a 10cm gap at the foot of the sail when the sail is properly down hauled. Look at a Neil Pryde mast extension if you think you may have this problem. They have a true 0cm minimum.
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Made in the USA! Everyone talks about wanting to buy things made in the USA. , and thanks to the guys at Chinook, here's your frik'in chance to put you money where your mouth is!