One-piece vise. The only downside that one can understand with leverage is that the stops are not symmetrical. Very minor inconveniences. Fully enclosed vise, interchangeable jaws, etc. This vise will do whatever you need it to do. Holds torches, solvents, shocks well and ensures smooth operation. Don't skimp on a crappy vise and spend more money later. Buy a Wilton and that's it.