Designed to fit on the new Ford Mustang 5.0L engine. Manufactured to a beautiful finish from aerospace grade 6061 aluminum for strength and weight. A great way to dress up your 5.0L Mustang engine bay.This billet water pump pulley weighs in at slightly over one pound which is one third less weight than the factory water pump pulley to help reduce accessory drive rotating mass.It retains the factory pulley diameter to ensure no changes in water pump flow or requiring serpentine belt changes. Easy to install and requires no permanent modifications to the vehicle. Comes with stainless steel hardware.