1970, 1974, 1978 and 1982 Steering Column Ignition Key and Door Lock Key Blanks Square Head Reproductions include the key knockout. This is the primary key that would be used for the dash ignition switch and the door lock button lock.
These reproduction primary keys are the "finishing touch" for any 1970, 1974, 1978 and 1982 Corvette restoration. Raised letters - GM Mark of Excellence - is on both sides of the keys.
When your Corvette left the factory, it was equipped with two of each primary and secondary keys.