The Dorman Carbon Steel Counterclockwise (Left) Wheel Lug Stud is designed to meet SAE automotive industry standards for durability and strength. This wheel lug stud is made from carbon steel and has undergone salt spray testing for 72-hours to simulate three years of corrosion resistance. It also undergoes industry-standard proof-load testing to ensure strength and features a black oxide finish for corrosion resistance. FleetPride is your First Click in Heavy Duty®.