Tuff Stuff, 53662, 12" Quick Release Bar Clamp, Trigger Spreader, Maximum Jaw Opening 12", 2" Throat Depth, Squeeze Grip To Clamp, Quick Release Trigger Allows For Easy And Fast Adjustments, Non-Marring Pads Protects Project Surface, Ergo Soft Grip Handles. A simple squeeze of the lever allows you to tighten these clamps with one hand, freeing the other hand to align the items being clamped. A push button releases the jaw to slide down the hardened steel bar. The fixed jaws can also be repositioned so each clamp can apply a spreading force.