This Quick Change Bar Clamp from the Irwin Quick-Grip range has a 455mm clamping capacity and 665mm spreading capacity 

The Irwin T518QCEL7 bar clamp features a quick-change system that converts the clamp to a spreader in seconds. This provides the consumer with a greater clamping hold load of 135kg and gives increased versatility for a range of jobs. Its heavy-duty construction makes for a durable, long-lasting clamp that is up to the task.

Features:  

• Square XP-style protective pads protect the work surface 
• Heavy-duty construction makes for a durable, long-lasting clamp 
• Improved quick-change screw mechanism allows for easy conversion to a spreader  

Specification: 

• Net Weight: 1.057kg 
• Clamping Capacity: 455mm (18in) 
• Spreading Capacity: 665mm (26in)