These are shouldered nuts (which help center the rim).

The shoulder allows penetration through the thick aluminum rim to reach the stud that you have in the drum.

Some aluminum rims have a flat seat, so these nuts have a flat seat and come with a flat washer to turn on.

Early EMPI 5 Spoke alloys use this nut and stud kit.

These have the same 14mm size stud that is stock on late style 4 bolt pattern Beetles or Early Kombi's.

The nuts screw on to the stud via a 1/2-20 pitch thread.

This kit has 4 Nuts and studs with washers. So if you are doing a whole late Beetle, you'll want to buy 4 of these, or if you are doing a early Kombi you will need 5 sets.

Beetle 1968 and on is 14mm Wheel bolt size

Kombi up to 1971 is 14mm Wheel bolt size