The Dorman 16 Serrated Carbon Steel Counter Clockwise Wheel Lug Stud is designed to meet the highest standards of automotive industry strength and durability. This wheel lug stud is made from carbon steel and has undergone industry-standard proof-load testing to ensure its strength. It has also been salt spray tested for 72 hours to simulate three years of corrosion resistance. The black oxide finish provides additional corrosion resistance. With its 1.323" head diameter this wheel lug stud is sure to provide a secure fit. FleetPride is your First Click in Heavy Duty®.