The best way to describe this clamps is...It's like a "c clamp you don't have to thread up and down. Just a quick squeeze and poof, your locked down. The release can be done with one finger, how simple is that?A spring clamp of this size would take some real brawn to line up and clamp. Not this one people, it's as easy as squeezing toothpaste from a tube. It won't rust or leave those c clamp dimples we all hate. It' plenty big,wont mar your work and the jaw  ends pivot for a good fit. Way to go American Tool, this ones a hit. I cant wait to see whats next. Now get out there and clamp away.