Not everyone caulks for a living, but a quality caulk gun helps yield professional results. The square rod technology with double gripping plates provides for ease of extrusion even in cold temperatures. The smooth drive rod rotates four times for longer life than a round rod. It has a thumb-activated pressure release and a handy puncture wire that tucks inside the handle grip when not in use. You can adjust the grip to fit the size of your hand, making it more comfortable to hold for long periods of time. Designed for spouted cartridges. Made in Taiwan.