It is quite strong but mine is warped in length and cannot be used or trusted as a square. This curvature also creates inaccuracies in all measurements and holes. Personally I plan to straighten it on my 0.00001 precision jet prototyping press, after that it should be fine and usable. As it is, it differs by 1-1.5mm from front to back. Come on, China, the best quality control, and you'd rock it, but quality control is a step you're notorious around the world for ignoring.
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