Bar clamps are available in many jaw and throat sizes, bar lengths and handle styles to provide a range of clamping capacities. Since the bar remains reliably straight under clamping force, you can clamp work against it to prevent misalignment. The moveable jaw on the fast-acting type may have a tilting plate for gripping angled or tapered workpieces. Bar clamps with a trigger style handle are easy to adjust with just one hand.