They definitely make joining corners easier and are a well made tool, it's a bit difficult to get very boards with them I can't be a strict manufacturer with since that Design allows boards of different thicknesses to be joined, it would be very difficult to design the clamp so that it didn't have a bit of flexibility when it snapped into place. Overall, this is a well-made tool that's accurate enough for crafting cabinets. , they are not precision typist's tools, but they are accurate enough for most woodworking projects. If you want, you can set them with absolute precision like almost any woodworking tool, no matter the price.
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