These wheel lug studs are made of carbon steel and tested to demanding automotive industry standards to ensure strength, longevity and safety. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Chevrolet Express 3500: 2003, 2004, 2005, 2006, 2007, 2008] - [Chevrolet Silverado 3500: 2001, 2002, 2003, 2004, 2005] - [GMC Savana 3500: 2003, 2004, 2005, 2006, 2007, 2008] - [GMC Sierra 3500: 2001, 2002, 2003, 2004, 2005]