The corners are square and match the corners of the box perfectly. But when you tighten that yoke, the corners of the yoke warp and things don't line up straight. A friend and I were trying to clamp a 6x6x4 beveled box out of 1/2" spruce. We tried many times but couldn't get the clamp tight and square at the same time. The tape trick is more reliable and easier. This clip can use thicker material will work, but for things like jewelry boxes, thick material is not an option.
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