From the Manufacturer
The invention of Quick-Grip bar clamps revolutionized clamping with the introduction of the first one-handed bar clamp. Now comes an even more versatile addition to the line of Quick-Grip bar clamps: the Quick Change bar clamp/spreader. It is quicker to use and more versatile. This 18-inch bar clamp changes into a spreader as quick and easy as 1,2,3. No tools required. The Quick Change multi-position jaw can be positioned anywhere on the bar making even the most challenging clamping or spreading task a snap. This Quick Change Quick-Grip Bar Clamp/Spreader has a clamping capacity of 18-inches, and a spreading capacity of 7-1/2-inches to 26-5/8-inches. The quick one-handed operation means less hand fatigue, and combined with the ability to easily slide the handle into position by engaging the metal Quick Release Trigger, clamping has never been so quick. The Ergonomic Pistol Grip provides a comfortable grip and concentrated clamping pressure. This 18-inch bar clamp/spreader comes with non-marring, stay-on pads. These pads are designed to firmly stay in place while clamping, yet they are easy to remove or change, if desired. The Quick Change bar clamp/spreader is manufactured with quality and pride in the USA. Full lifetime warranty. Each Quick-Grip clamp is warranted to be free from defects in material and workmanship for the life of the tool, except for damage caused by abuse, misuse or alteration.
IRWIN Tools Quick-Grip SL300 Series Bar Clamp / Spreader, 18-Inch (518QCN). Provides up to 300 pounds of sustained clamping force. Tested to complete 5,000 cycles without failure, more than other brands. I-beam bar reduces flexing and bowing. Heat-treated, black oxide carbon steel provides maximum durability. Clutch lock mechanism with quick-release trigger lets you quickly and easily adjust jaw with the touch of a button. Locking swivel jaws with removable full-face pads distribute clamping force easily, while protecting the work surface. The Quick-Change screw easily converts the clamp to a spreader and eliminates end-jaw rattles. Affixed spring-loaded screw won't get lost.