steel 10.9 chrome Grade AA – first-class repair and as an extremely attractive accessory Product description Whoever maintains and works on their scooter themselves should make sure a supply of suitable fastenings, gaskets, etc. are available in your workshop all times. What can be more annoying then being in the middle of a complete engine rebuild or similar to be stopped in your tracks by the lack of any particular nut or bolt OEM numbers (for comparisons): S.8421 – 008421 (PIAGGIO)