This caulking Gun features a Dual Thrust system and is able to change from 12:1 to 24:1 thrust ratio with the flip of a switch. It also has a 360-degree rotating barrel designed to increase comfort and decrease user fatigue. With 4 different integrated patented systems the OX Pro Dual Thrust Caulk Gun is designed to be comfortable, practical, and user-friendly. Made from high quality metal and shock absorbing rubber at common impact points, it ensures a dependable, long-lasting life. The rubber over molded grips are easy on the hand and absorb harsh impacts. This caulking gun has a capacity of 858ml (29oz).