These single-actuated pneumatic vise clamps are actuated by air pressure for quick and easy clamping. Rotate the handwheel to position the jaws and then apply air pressure to clamp. These single-actuated pneumatic vise clamps are actuated by air pressure for quick and easy clamping. Rotate the handwheel to position the jaws and then apply air pressure to clamp. The clamping stroke is 2 mm. Release the air pressure, and the jaw will move back by spring force. Body made from 4140 steel, induction hardened and precision ground. Jaws made from quenched and tempered 4140 steel, precision ground. Handwheel made from A5056 aluminum with an anodized finish.