Chrome Silver Cone Seat Trailer Wheel Locks by McGard. 1/2" x 20 Thread Size, 13/16" Hex Size and 1.46" Overall Length. Set of 4 Locks and 1 Key. Protecting the world's finest wheels and tires from theft since 1964. McGard wheel locks are manufactured in the USA to meet or exceed O.E.M. standards for safety and durability.