Hellermanntyton cable ties inside serrated for cable tray ctf series hellermann tyton 111 98161 the hellermanntyton 111 98161 ctf250 is a cable tie with the inside serrated from the ctf series this cable tie has been designed specifically to be used exclusively with both uk and european styles of cable tray the tieey offers a more secure fixing and is easy to use hellermanntyton 111 98161 ctf250 pa66 na l1 inside serrated tie nat 13mm