Speed nut, B4.2.

To fit:
911 1965-1989 - Used in the brake system, rear bumper, interior, wiper assembly
914 1970-1976 - Used in the brake system, dashboard, battery and fuse box
928 1978-1991 - Used in the front and rear spoiler and cruise control assembly
944 1982-1991 - Used in the instrument cluster
968 1992-1995 - Used in the instrument cluster
911 (964) 1989-1994 - Used in the electric system to secure relays on Turbo models