Irwin quick grip quick change one handed trigger bar clamps spreaders irwin t512qcel7 this irwin 300mm quick grip one handed trigger bar clamp spreader has been specially designed for fast general purpose clamping the clamp has a lockable swivel jaw that allows uneven surfaces to be clamped and ensures that pressure is evenly distributed irwin t512qcel7 quick grip quick change bar clamp 12in 300mm