This CRL 6" Quick-Grip® Bar Clamp is smaller in size than Cat. No. 506QC. It has a mini "Clamp Only" design with a jaw opening of 152 mm (6") is handier for smaller jobs where the spreader feature is not required. Gripping jaws have vinyl pads. It is the only bar clamp that takes only one hand to operate. It converts 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. The unique pistol grip handle lets you hold the clamp and adjust jaw pressure instantly with only one hand. One finger unlocks a quick-release trigger that releases in a snap. Made of high tech resin so it is light and easy-to-handle. Quick-Grip has large, pliable pads that won't mar work surfaces.