27.5mm on out side of threads SOLD EACH - BUY 2 IF YOU NEED A SET Honda CB450K3 1970 Honda CB450K4 1971 Honda CB450K5 1972 Honda CB450K6 1973 Honda CB450K7 1974 Honda CB500T 1975, 1976 Honda CB550 1974 Honda CB550F 1975, 1976, 1977 Honda CB550K 1976, 1977, 1978 Honda CB550K1 1975 Honda CB750A 1976, 1977, 1978 Honda CB750F 1975, 1976, 1977, 1978 Honda CB750K 1969, 1976, 1977, 1978 Honda CB750K1 1971 Honda CB750K2 1972 Honda CB750K3 1973 Honda CB750K4 1974 Honda CB750K5 1975 Honda CR250M 1973, 1976 Honda CR250M1 1975 Honda MT250 1974, 1976 Honda MT250K1 1975 Honda XL250 1972, 1976 Honda XL250K1 1974 Honda XL250K2 1975 Honda XL350 1974, 1976, 1977, 1978 Honda XL350K1 1975 1002Z (358C)