Quick Change Bar Clamp 450mm (18in)|The IRWIN Quick-Grip Quick Change Bar Clamps have the following features: A quick change system which converts clamp to spreader in seconds, with a clamping hold load of 135Kg|A lockable swivel jaw feature which enables uneven surfaces to be clamped|Square XP-style protective pads for protecting the work surface|Heavy-duty construction which makes for a durable, long lasting clamp