IRWIN QUICK-GRIP? Quick-Change? Medium-Duty Bar Clamps can be converted from a clamp to a spreader in seconds, with a clamping hold load of 136kg. The lockable swivel jaw enables uneven surfaces to be clamped and it is fitted with square XP-style protective pads to protect the work surface from damage. Enhance your clamps with a wide range of QUICK-GRIP? Clamp Accessories. 1 x Irwin Quick-Grip? Quick-Change? Medium-Duty Bar Clamp 450mm (18in)