The Delphi ABS Wheel Speed Sensor (part number SS20324) is a sensor designed to measure the rotational speed of a vehicle's wheels. It is an essential component of the anti-lock braking system (ABS), as it provides real-time data to the ABS control module to help prevent the wheels from locking up during sudden braking. This sensor is made by Delphi, a leading manufacturer of automotive parts, and is compatible with a variety of vehicle makes and models. It is a durable and reliable sensor that is crucial for maintaining safe and efficient braking performance.