Newborn 255 Super Smooth Rod Revolving Frame Caulking Gun, 1/4 Gallon Cartridge, 18:1 Thrust Ratio Steel revolving frame caulking gun for 1/4-gal. Cartridges Thrust ratio of 18:1 for use with high viscosity materials Smooth pressure rod requires less force and is quieter than a ratchet-style pressure rod Revolving frame allows cartridge to rotate for maintaining bead orientation when caulking around corners Zinc alloy handle and trigger for corrosion resistance Professional-grade 1/4-gallon high-thrust ratio caulk gun 18:1 thrust ratio Revolving barrel Zinc alloy handle T-bar