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 (be sure to check your vehicle trim using the Amazon garage) - [Ford F-450 Super Duty: 1999, 2000, 2001, 2002] - [Ford F53: 1999, 2000, 2001, 2002, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020] - [Ford F-550 Super Duty: 1999, 2000, 2001, 2002]