The product is a set of vintage aftermarket water pumps for 1950-1951 Mercury cars, featuring a 5/8" grooved pulley. It is a bolt-on style water pump with a cast iron housing, designed for engine cooling. The water pumps comes with a pulleys and is belt driven, making it easy to install without the need for drilling or modifications. Manufactured by Adco Rebuilt in the United States, this water pump is a new old stock (NOS) item that is perfect for vintage car enthusiasts looking to replace their original equipment.