These are nice strong hinges. The action is a little bit tight. The flat part near the hinge is nice. It allows you to easily align the hinge.
The length of the shaft is 1/2" . Using these, you will need to have about a 2-3mm gap.
I bought these for a small 34" wingspan foamie. I think they are a bit too big and too tight of action. They will work nice on something a little bit bigger.
The quality of plastic is very nice, not brittle. Good stuff.