Self-centering to insure that the stud isinstalled at the correct angle. 
Kits include a bearing seat and nut
Will not damage wheel stud threads Automotive kit. 
Sizes:  7/16"×20 UNF,  1/2"-20 UNF,  M12×1.25,  
M12×1.50, M12×1.75 and M14×1.5
Packing: BMC