The Chinook Aluminum Mast Extensions are the most popular mast extensions in the US. And for good reason, they are well built and a good value. Plus they're made in the USA!
Specs:
12cm maximum extension-short
28cm maximum extension-medium
48cm maximum extension-tall
2cm increment adjustment
4cm 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 4cm 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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