These gun is used with up sealent.The ratchef style pressure rod has teeth that hold the rod in place after each pull of the trigger. For a thinner materials this helps minimize drips. A spout cutter is built into the sides of the gun for opening cartridges without a knife and a wrist allows the gun to be held more securely. The caulking gun includes one dual hotel cup for use with bulk caulk or sausage packs one ring cap for attaching nozzles three plastic, one nozzles and one 12 diameter metal nozzle. Caulking gun also called caulk or cartridges guns dispense a controlled flow of products such as caulk sealant and adhesives from a tube or cartridge. A manual caulking gun consists of a frame which holds the tube a trigger and a rod which moves forward when the trigger is depressed dispensing the product. Manual caulking guns have a ratio. The higher the ratio the easier it is to dispense the caulk sealent.Air powered caulking gun also have a frame and a trigger but are used with an air pressure regulator that pushes the product from the tube using air pressure instead of rod. It is eco friendly.