These clips open slightly wider than 3.5 inches at the tips, although 3 inches is the maximum around the jaws to be kept parallel to each other. I can open them with one hand. (YMMV I have a large grip/medium strength) The rubber grips and tips are easy to remove but stay firmly in place. The end of each handle has an 8mm or 0.3 inch diameter hole when you attach cables etc. The jaws have a slightly curved double tooth under the rubber tip. Made in China.