I have all the aluminum rafter angles in different sizes. The features are identical, but the adjustable lever makes all the difference. I'm building hex shelves that require beveled joints to be cut at equal angles. With a traditional angle, you have to re-measure the angle for each cut. By locking the adjustable arm in place, you can be sure the exact dimensions are locked in, meaning you can make repeat cuts. For me it was very convenient because I made 18 cuts. Saves a lot of time. Yes they are perfect, I didn't have to go back and repeat.
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