This is the most common nut found on your moped. It is called 6mm, or M6 in Metric speak. If you have a 10mm wrench or socket, and it fits the nut you need, this is it. This is the locking version of the common 6mm nut.
Used on exhaust studs, head bolts, and everywhere else.
Quantity discounts after 5. Keep adding them to your cart and watch the prices fall.