I'm sure they're probably pretty good for a 6" gutter. However, they're not good for 5" (especially if your shingles overlap the gutter a bit). You should bend them just enough so that the bend is an inch above the gutter, so they're visible from the ground. Besides, it is quite difficult to bend them during installation I can't imagine how awful they would be for 4". I don't know why they don't have 3 different versions/sizes. Too bad I didn't go for one of the other options have.
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