CTA Tools 4221 Lug Nut Flip Socket (18.5mm x 19.5mm) Lug Nut Flip Socket - 18.5mm x 19.5mm. 18.5mm x 19.5mm Internal 1/2" square drive Black finish Applications include GM, Chrysler 18.5mm size fits 19mm lug nuts missing chrome cover, 19.5mm size fits 19mm lug nuts with damaged or distorted caps