The tool that uses magnetic parts is a compass.
A compass is a navigational tool that uses a magnetic needle to align itself with the Earth's magnetic field. This allows it to point towards the magnetic North Pole. The needle in a compass is a magnetized part that interacts with the Earth's magnetic field to provide directional guidance.
Unlike a lever, a ramp, or a pulley, which rely on mechanical principles like leverage or incline to perform their functions, a compass specifically utilizes magnetic properties to determine direction. So, in the context of the question, a compass is the tool that uses magnetic parts.
