Kics Leggdura Shell Type Lug Nuts RL53This unique two piece design includes a chromoly SCM435 alloy nut and lock with Steel key. A Duralumin shell screws on with a the provided ABS key which significantly reduces the chance of the Duralumin shell to be scratched when installing or removing the lug nuts. Thread size: M12xP1. 50 or M12xP1. 25 Total length: 53mm Shell type lock set is included Steel cores provide excellent strength and durability Special plastic adapter (19mm hex) prevents