Features and Benefits:Heavy duty impact-grade CrMo steel will not split or crack;Designed to fit lug nuts that measure 17, 18.5, 21.5 or 26mm from corner to corner or standard equivalent;Oil resistant black phosphate finish;1/2 inch drive;Use to remove lug nuts & locking lug nuts, if the lug nut key is misplaced, lost or lug nuts are worn, stripped or damaged;Note: sizes provided are the internal diameter opening, and taper down. Measure your lug nut at the corners to determine the most suitable socket size. This may NOT correlate to the actual lug size.;Heavy duty impact-grade CrMo steel will not split or crack. Designed to fit lug nuts that measure 17, 18.5, 21.5 or 26mm from corner to corner or standard equivalent. Oil resistant black phosphate finish. 1/2 inch drive Use to remove lug nuts & locking lug nuts, if the lug nut key is misplaced, lost or lug nuts are worn, stripped or damaged. Note: sizes provided are the internal diameter opening, and taper down. Measure your lug nut at the corners to determine the most suitable socket size. This may NOT correlate to the actual lug size.