These wheel lug studs are made of carbon steel and tested to demanding automotive industry standards to ensure strength, longevity and safety.Vehicle model years this part fits:Ford Excursion: 2000, 2001, 2002 Ford F-250 Super Duty: 1999, 2000, 2001, 2002 Ford F-350 Super Duty: 1999, 2000, 2001, 2002 Ford F-350: 1998, 1999, 2000, 2001, 2002 Ford F-450 Super Duty: 1999, 2000, 2001, 2002, 2003, 2004 Ford F53: 1999, 2000, 2001, 2002 Ford F-550 Super Duty: 1999, 2000, 2001, 2002, 2003, 2004