The Chinook 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 are made in the USA!
38cm 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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