Uniframe construction for greater durability. Drip-Free Spring Clip Drive designed as an automatic stop flow mechanism.Powerful piston rod design provides trouble-free performance. With spout cutter, seal puncture tool and ladder hook. Nomore hand tiring ratcheting. No mess and no waste. 10:1 thrust ratio. E-Z load open front cap and cartridge retainer spring. Includes "Caulk Buddy" finishing tool with caps.