I use these framing clips that I make for wood signs. They have a good grip and are easy to use. My biggest problem is that the corner piece moves (goes back and forth) when I try to pinch it. I also noticed that I have to make sure that the pieces of wood are pushed together (flush) after clamping. Made of durable plastic and seems to be holding up pretty well. The issues I'm having won't stop me from buying another set, which I might do soon.