These are handy little exhaust nuts. These are smaller than your more common exhaust nut and require an 8mm socket to install instead of a 10mm socket.
A lot of aftermarket exhausts have a larger header and are difficult to get a 10mm socket securely on the nut to tighten it. These make it simple.
These are m6 x 1mm. They are 8mm tall.
Sold individually!