Engineered Ergonomic Construction. Rotating Barrel. Rugged Composite Construction. Reinforced Cage For Extra Strength. Sharp Precision Cutter. Extra Long Clean Out. Drip/no Drip Feature For Bead Control. Recommended For Use With All Caulks Construction Adhesives Including Polyurethanes, Concrete Masonry And Roofing Sealants. 18:1 Ratio.