Exhaust Nuts M8 Locking

These are the fancy nuts we use on exhaust stuff.  Copper plated so it comes back apart when you need it to.  Locking with the crimped all metal portion so it stays tight.  

The reduced 10mm Hex  gives more wrench room.  

Also in standard 13mm Hex.

M8x1.25 Threads are common across most all of the Saabs.