Got these cup holders to use on a bass boat, the pedestal seats, to hold yeti coffee tumblers. And they do the trick! Easy to attach and detach. The one cup holder has been attached to a mount at the very front of the boat and has stayed in place through waves and road travel. Easy to take off and store too. Very durable! Very sturdy! Holds a regular size Yeti tumbler as well as the larger size, water bottles, soda bottles, cups. Very impressed! Highly recommend!See full review