Portable Clamps?are locked automatically when closing, as one or both handles are squeezed against the central position. The jaws of most models are drop-forged in steel and most are supplied with 1 or 2 adjustable spindles. Most medium and heavy-duty squeeze action plier clamps feature the DESTACO trigger release for easy one-hand opening. All forged models are heat-treated alloy steel, machined to close tolerances. Squeeze Action clamps provide quick and flexible clamping.