What a shock. If only they were stored and used for the first time today, just a few weeks past the return window. None of the 4 squares are square. You're almost up! Full degree but not less than half a degree. See the photo against the background of one of my 5 machine angles and with a goniometer accurate to 0.1 degrees. The truth is these squares are rubbish and I will try to return them for a refund. My advice: Spend another $$$ and buy quality products from reputable woodworking companies like Infini…Tools etc.