Abstract: A foldable exterior rearview mirror includes a housing, a bracket fixed to a side of a motor vehicle, and a connecting arm mounted in the housing and including a sleeve portion suitable for receiving an electric adjusting device or manual adjusting device. The manual adjusting device includes a pivot shaft and a support frame. The pivot axle includes an axle and a base fixed to a lower end of the axle. The base is mounted to the bracket. The support frame includes a cylindrical portion and a coupling portion extending outward from a periphery of the cylindrical portion. The cylindrical portion and the coupling portion of the support frame are removable engaged in the sleeve portion of the connecting arm. A user may select the manual adjusting device or the electric adjusting device to be mounted in the sleeve portion of the connecting arm.

Abstract: A fastener cap includes a shank having a longitudinal hole with a closed first end and an open second end. The shank further includes at least one engaging section on an inner wall delimiting the longitudinal hole. The engaging section has an inner diameter smaller than that of a remaining portion of the longitudinal hole. The engaging section is engaged with threading of an exposed portion of a shank of a screw and thus shields the exposed portion of the shank of the screw. The closed first end of the fastener cap improves the rust-preventing effect for the screw.