Orbea Main Pivot Expander Cone Washer (5x8x0.5 mm)
This washer is used on the following Orbea bikes:
Orbea Occam 2018 (TR and AM) carbon frame (number 2 in the Occam expanded view diagram).
Orbea Rallon 2018/2019 carbon frame (number 8 in the Rallon exploded parts view)
Yes this is a very small washer!
If you are not sure if this is the right part for your Orbea - go to the Orbea spare parts section of their website and enter your bikes serial number.
Orbea product description: ARANDELA 5x8x0.5 OCCAM