This is a metal dust cover for the front wheel bearing that fits into the hub. 2-1/16" Dia, "7/8 Deep For 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 Chevrolet Cars