IRWIN QUICK-GRIP Quick-Change Medium-Duty Bar Clamps can be converted from a clamp to 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. Technical Specs: Clamping Capacity: 300mm (12in). Spreading Capacity: 515mm (20in). Clamping Force: 136kg.