Allows you to easily access coffee, water bottles, cups or other beverages when needed without worrying about spills; Note: This cup holder is only for placing water cups. Suitable for bottles from 2 cm to 4.5 cm in diameter Universally compatible with walkers, rollators, wheelchairs, strollers, bicycles, bed rails, transport chairs, etc. Note: The data are all measured manually, please allow 1-3 cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.