New O.E.M. Triumph & BSA Unit Singles Duplex Primary Chain.
Features 70 Links & is "Endless" which means it does not have a Masterlink as O.E.M. Fits most 250 & 350 BSA Unit Singles from 1959-1973. Also fits all Triumph 250 Unit Singles (Excluding Triumph Cub) (TR25W Trophy, T25T, Etc) from 1968-1972.