Nut dome 8mm, Lambretta with nylon insert as per original wheel nuts, stainless steel, MB

Amongst many applications this MB made dome nut is specifically used on wheel rims. 

This dome nut has the nylon locking insert inside as per original Lambrettas.

Can also be used on exhaust mounts on a crankcase side or with any 8mm thread.

These are standardised 13mm across flats.