The award winning BESSEY PowerGrip™ is the only one-handed clamp capable of creating 1000 Lbs of clamping force - truly industrial grade! Easy slide button to allow you to position the jaw quickly with one hand. Pumping the two-way lever holds the work piece in place with up to 200 Lbs of force. Need more? Turn the ACME threaded spindle to increase the force up to 1000 Lbs. Comes with removable non-marring pads for more delicate finished surfaces. BESSEY. Simply better.