Rml bottle systemdual position saddle rail mount to dial in the ideal angledesigned to mount 1 or 2 water bottle cagesfor nearly every saddlespecially designed to fit tri saddles that often have trouble finding their rear hydration matchstamped and machined 6061 t6 aluminum228gincludes 2 lightweight profile design cagesfor standard bottle use only bottles without a significant retaining lip may eject from the cage when riding uneven terrainnot for offroad use