These wheel lug studs are made of carbon steel and tested to demanding automotive industry standards to ensure strength, longevity and safety. With over 80,000 products backed by a team of product engineers and experts based in the United States, Dorman is the first choice of automotive professionals, backyard mechanics, and do-it-yourselfers all over North America. Durable material - carbon steel meets SAE automotive industry standards for strength and hardness Corrosion resistant - extensive salt spray testing helps ensure years of durability against rust Tensile tested - lug studs undergo industry-standard proof-load testing to ensure strength Trustworthy quality - backed by team of professional engineers and quality control specialists in the United States Vehicle model years this part fits:AM General Hummer: 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999Chevrolet C20 Pickup: 1971, 1972, 1973, 1974Chevrolet C20 Suburban: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986 Chevrolet C20: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986Chevrolet C2500: 1988, 1989, 1990, 1991Chevrolet C30 Pickup: 1971, 1972, 1973, 1974 Chevrolet C30: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986Chevrolet G30 Van: 1971, 1972, 1973, 1974 Chevrolet G30: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996Chevrolet P20: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989 Chevrolet P30 Van: 1971, 1972, 1973, 1974Chevrolet P30: 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1995, 1996, 1997, 1998, 1999Chevrolet R20 Suburban: 1987, 1988Chevrolet R20: 1987, 1988 Also fits more vehicles not listed here Manufacturer part number 610-181 Vehicle model Hummer, C20 Pickup, C20 Suburban, C20, C2500, C30 Pickup, C30, G30 Van, G30, P20 Vehicle year 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999 Vehicle make AM General, Chevrolet, GMC Vehicle fitment type Specific Automotive parts division Direct Replacement Brand Dorman HELP Automotive specialty part type Wheel Lug Stud Material carbon steel Color Silver Weight 1.6 lb Items included 10 Studs Vehicle type Car Compatible cars AM General 1999-92, Chevrolet 1999-71, GMC 1999-71 Pack quantity 1