Great Stuff Heavy-Duty Caulk Dispenser's were designed with the tradesmen in mind. Packed with unique features, the 29-Ounce. heavy-duty caulk gun makes caulking effortless and comfortable for all day use. The steel push rod mechanism provides a 12:1 thrust ratio for caulking materials. Silent squeeze mechanism prevents squeaking when activated, while still ensuring sufficient pressure. Ergonomically designed handles are dipped in rubber, providing a comfortable and secure grip for all day use. The built-in poker is permanently attached and makes starting the caulking effortless. The adjustable dripless mechanism ensures that the caulk does not continue to flow, preventing a mess from being created.