1/10 Gallon Superior E-Z Thrust Blue Caulker, Smooth Rod Caulking Gun For Use With 10 OZ Cartridges, Features E-Z Thrust Mechanism, Thumb Activated Pressure Release, Built In Spout Cutter, Seal Puncture Tool & Ladder Hook, Ideal For Professionals & Do-It-Yourselfers, Thrust Ratio 10:1.