The biggest thing that the signing of Stephan Lictsteiner brings to Arsenal is his undeniable experience. Lichsteiner has been one of the most dependable players in his time in Italy and has also captained his national side in his 3 World Cup tournaments.
He is just one short of the magical number of 100 international caps for his side, scoring 8 goals and assisting 7 in the process.
In his entire career, Lichtsteiner has played in over 500 games and has the experience and the intellect to match that number. And considering he cost Arsenal next to nothing, he is a brilliant addition to the side, at least in terms of the experience he brings to the table.