1. 360 Degrees Rotation:The Bike Cup Holder can be rotated 360 degrees. It can be fitted on handle bar, under seat, down tube, fork, front pipe, and it also can be used on most strollers. 2.With a large caliber design, fits most baby bottles, coffee mugs and water bottles. 3.The cup holder is adjustable and suitable for all bottles with a diameter of less than 13 cm, such as water bottle, coffee cup, baby bottle, etc. The clip of the cup holder is suitable for the stroller bar with a diameter of 1.3 to 4 cm and clamp it firmly to the baby carrier bar to prevent it from sliding easily. 4.EASY TO USE: The cup holder is easy to install, clamp and go with no tools or assemblies. What's more, it's easy to erase too.