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 K30 Pickup: 1977, 1978] - [Chevrolet K30: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986] - [Chevrolet V30: 1987, 1988] - [Chevrolet V3500: 1989, 1990, 1991] - [GMC K35: 1977, 1978] - [GMC K3500: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986] - [GMC V3500: 1987, 1988, 1989, 1990, 1991]