Review on Upgrade Your Furniture With Adiyer'S 10Pc 1.5-Inch Folding Butt Hinges In Durable 304 Stainless Steel - Perfect For Wooden Boxes, Jewelry And Crafts by Marc Sortijas

As others have said, the screw holes are not properly countersunk and the screws (not included BTW) do not sit flush. The result is that the hinges will never close to 0 degrees once installed. Took me 10 seconds with a drill press to bore a proper countersink, but not everyone has that option available (after drilling, I also had to re-flatten then hinges. They are made of a light-grade metal and bend rather easily).TL;DR - probably fine for vertically hinged doors but DO NOT PURCHASE for a case lid (jewelry box, etc.) unless you have the means and the patience to redrill the holes yourself.