After having ankle surgery and doing through the no weight baring period. I bought myself a pink knee scooter and these very sturdy cupholders in pink. I was at first going to attach them to my wheelchair I had, but then decided to put them on my knee scooter instead. The cupholders will not move no matter where you put them. I like that they come in a variety of different colors. Not only can you use them to hold drinks, but they're great if you have to carry other items like pens, or spare change. As for size, if you go to a fast food place just keep in mind these cupholders won't hold your extra large drink or any of the really wide waterbottles they sell in the vending stores.

Purchased for my son's walker. He recently had to have his leg amputated due to an accident. This fits perfectly on his walker and crutches giving him the opportunity to fix his own drinks. They grip nicely ans he is able to put 2 cups in there and this device does not move!

Yo filmmakers - Awesome accessory for the set - sturdy and perfect to make any C-stand a water bottle holder. Make your director happy and get one for your monitor stand.
***UPDATE*** Between uses on set ROBOCUP works great as drink holders in my van. Just cut a piece of scrap closet rod and put it through the rear door handle. ROBOCUP clamps on above and below the handle. One drawback - Now I'm probably going to have to buy a 2nd ROBOCUP for the opposite door.

Got tired of having to stop (walk-behind) mowing to get a drink. Unfortunately, I don't have any verticals on the mower, but I attached it to the handle arm, and it does the trick (though if there were some way to rotate the individual cup it would really help). I put a drink bottle inside, top-down, which keeps the vibration from the mower and the terrain from bouncing it out. One real truth: those clamps are NEVER gonna let go!

You won't regret purchasing this AAAAMMMAAAZZZZIIIINNNGG cup/fishing rod holder. Wish I came across this sooner. To clamp onto something, you have to squeeze the holders to open the clamps. A simple and clever design.

UPDATE: If I could rate this company separately, I would surely give them a 10. They replied instantly to an email I sent inquiring about a replacement for a lost cap... I only needed one but they kindly sent two! A+++ THANKS, Robocup! I will surely be recommending you guys!