A grease gun is a type of hand tool commonly used in automotive maintenance and mechanical applications to apply lubrication to various components. It consists of a cylinder that holds grease, a nozzle for dispensing the grease, and a handle for pressurizing the grease inside the cylinder. Grease guns are designed to deliver lubricants efficiently and precisely to help reduce friction, prevent wear, and extend the lifespan of moving parts. They come in different sizes and styles, including manual and pneumatic options, to suit various needs and preferences.

Gun series refer to a collection or line of firearms that share similar design features, functions, and characteristics. These series are often produced by the same manufacturer and may include various models with different specifications tailored to meet different user requirements. Gun series can encompass a wide range of firearms, such as pistols, rifles, and shotguns, each designed for specific purposes like self-defense, hunting, or target shooting. Manufacturers often create series to establish brand recognition, build loyalty among customers, and offer a range of options for shooters with different preferences and needs.