The profile design century zb aerobar a one piece system offering multiple hand positions the armrest bridge effectivly sllow for length adjustability profile design century zb aerobar features the armrest troughs can be mounted in three different places giving you more width adjustability than any aerobar in this category multi fit system fits 260 mm and 318 mm bars 6061 t6 aluminium extension and forged bracket are shot peened for extra durability