The surfaces are perpendicular to each other as advertised. Operation is smooth and repeatable. The vise was larger than I expected but that turned out to be the case be an unexpected plus I use these vise for attaching firearm parts and they do a great job the larger size actually makes it easier to clamp smaller parts than the 2" vise I used I can slip my finger through from the bottom to position longer parts exactly where I need them. Great tool at a good price.
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