A Caulking Gun 9" is a handheld tool used for applying sealants, adhesives, or caulk from a standard 9-inch cartridge or tube. It consists of a metal frame, a trigger mechanism, and a plunger rod that pushes the material out smoothly and evenly. Caulking guns are commonly used for sealing gaps, joints, and cracks in construction, plumbing, and DIY home improvement projects.