This is a 3D CAD model of a manual caulking gun, a handheld tool commonly used in construction and glazing to dispense materials like sealants, adhesives, and silicone. The model shows all internal mechanical components including the trigger mechanism, plunger rod, spring-loaded release, and tube holder. Each part is color-coded for clarity, illustrating how force from the trigger advances the plunger to push material out of the tube nozzle.