310/ IRWIN Quick-Grip Q/GT546EL7N Mini Bar Clamp 150mm (6in). The IRWIN® Quick-Grip® Mini Bar Clamps have a revolutionary design and are fast and easy-to-operate. The high-tech resin body is sturdy and temperature resistant, and the 70kg clamping hold load makes for a perfect lightweight 3rd hand. The clamps have non-marking, stay-on pads that protect the work surface. Ideal for smaller jobs and applications in tight working areas.