These are not your average-Joe C-clamps! These have been augmented with added technological advancements like a single hand release trigger for quick release and/or repositioning upon your work piece, and a handy hand screw that increases or decrease the amount of pressure that is applied to an item, but these are not all. Some of these clamps take it farther and have optional features that all depend upon the c-clamp you wished to own. These optional features include such things as; swivel pads being present for the holding of angled items, and the overall length of the clamp. Which also affects the depth that the clamp allows items to be installed to, and the width of the jaw opening for what can be entered into the clamp itself. All making for a c-clamp that people whom have to work on a piece job love to have in their tool belt, or holding down the item that they are working upon.