The CTA Manufacturing 7-pc Flip Socket Set, No. 7307, offers two hex sizes in one socket. The half metric sizes are used for the removal of inflated, warped, and mangled chrome-cap style lug nuts found on many GM, Ford, Chrysler, Toyota, Honda, Jaguar, Range Rover, and more. The set includes 17mm x 17.5mm, 18.5mm x 19.5mm, 19mm x 21mm, 21mm x 21.5mm, 22mm x 22.5mm, 22mm x 22.5mm, 27mm x 27.5mm, and 1/2" drive extension.