This should have a split pin in it and attaches to your foot pedal that operates the master cylinder.
Split pin for common clevis pin list
GFK101 for
CLZ409 handbrake levers to cable on rear drum
GFK102 most mini clevis pins except CLZ409
GHF510 for
GCV1105 CV joint and rear hub nut
GHF511 for
GCV1013 CV joint
to make life a little eaiser, please see the TOOL36