This fits most standard cup holders. It's designed to adapt a Tesla cup holder to a 30oz Tumbler. The center is designed to hold a standard 12 oz can or a standard 16 oz energy drink can. Which is great since it keeps them from moving around. It also works great for most fast-food drinks. I highly recommend you print this in PETG, as I've had PLA versions shrink and warp in the heat of spring.