Newborn 315 Super Ratchet Rod Cradle Caulk Gun, 1/4 Gallon, 6:1 Thrust RatioThe Newborn 315 Super Ratchet Rod Cradle caulking gun has a steel half barrel frame that fits 1 4 gallon cartridges and has a 6: 1 thrust ratio for use with high viscosity materials such as acrylic, adhesives, asphalt, butyl, and cement. The ratchet style pressure rod has teeth that hold the rod in place after each pull of the trigger. For thinner materials, this helps minimize drips. The zinc chromate plating offers good corrosion resistance. A seal