The Dorman Carbon Steel Serrated Round Wheel Lug Stud is designed to meet the highest standards of automotive industry durability. This lug stud is made from carbon steel and has undergone industry-standard proof-load testing to ensure strength and durability. It has also been subjected to 72-hour salt spray testing to simulate three years of corrosion resistance. The black finish provides additional corrosion resistance. With its 1.5" head diameter, this lug stud is sure to provide a secure fit. FleetPride is your First Click in Heavy Duty®.