The Dorman M20 x 1.5 Flanged Hex Clockwise Wheel Lug Nut is designed to provide superior strength and durability. This lug nut is made from carbon steel and has undergone industry-standard proof-load testing to ensure its strength. It also meets SAE automotive industry standards for durability and has been salt spray tested for 72-hours to simulate three years of corrosion resistance. The black phosphate finish provides additional corrosion resistance. FleetPride is your First Click in Heavy Duty®.