Piaggio Vespa Rear Brake Adjuster Bolt PX, Cosa V50, PV, ET3, PK S-XL-XL2-FL PX, Rally, Sprint
Bolt used for the rear brake clamp, this is used on quite a few Vespa Models. The distinction between this bolt and other is the hole that goes through the middle, which is used to thread cable through it.
Comparison No. 015510 (PIAGGIO)