Extra-long barrel caulk guns with Twin thrust system has 4 edges of valve plates strengthen the thrust force on the plunger. Helps to use hard materials with ease. The auto flow stop system plunger goes back a few millimeters after every push to stop the flow efficiently. 360-degree for maneuvering in and around tight spaces. Features 1 qt gun with a powerful twin-thrust dispensing system 13-1/2 in long barrel and 360 deg rotating handle for maneuvering in tight spaces Seal puncture tool and auto flow stop to control material seepage /oozing Special hardened steel shaft and thrust plates for consistent, non slip performance Rugged steel welded construction, strong cast aluminum handle