The Performance Tool 3-pc 1/2" Drive Damaged Lug Nut Socket Set, No. W87140, is designed to remove damaged lug nuts and rusted or rounded-off nuts and bolts. Its heat-treated chrome molybdenum steel construction is engineered for strength, durability, and corrosion resistance, and it's black phosphate coated for durability and corrosion resistance. This tool includes lug sizes 17mm, 19mm, and 21mm.