This is a black shift knob with a 5/16" thread and a chrome jamb nut for the Muncie shifter, and 4-speeds models. This four speed shift knob comes with the engraved shift pattern. It fits the 1964-68 Chevrolet models including the 1967-68 Camaro, 1964-68 Impala, 1964-68 Nova, 1964-68 Chevelle, and 1964-68 El Camino.