Which tool is utilized for lubricating through grease fittings?

The grease gun is specifically designed for the purpose of lubricating machinery and equipment through grease fittings. This tool allows users to dispense grease accurately and efficiently into specific areas that require lubrication, ensuring that moving parts remain well-oiled and function smoothly.

The construction of a grease gun typically includes a reservoir for the grease, a plunger mechanism to force the grease out, and a nozzle or coupler that fits onto the grease fitting itself. This design enables precise application of grease, which is essential for maintaining the longevity and efficiency of mechanical systems.

Other tools mentioned like the hammer drill, half round file, and groove joint pliers serve entirely different functions, such as drilling, filing, and gripping, respectively, and are not suitable for lubricating machinery.