The new Performance Tool Vise is a great tool to have. The sides and bottom are machined flat and perpendicular to adjacent sides to allow the vise to be used one either side or on end. High strength grey iron castings are machined smooth for accurate movement with no lateral end play. The steel adjusting screw has a coarse-pitch thread for fast action. The jaws are hardened steel and replaceable. The stationary jaw is grooved vertically as well as horizontally for convenience in holding round pieces.