These "Vegas Style" Plastic Slide Under Drink Holders simply slide under a table's padded armrest. The lip at the bottom of each cup holder allows them to slide under the rail of a table for a secure place to rest your drink. Additionally, these slide under cup holders will work standalone - even without tucking them under anything. Our standard size cup holder fits standard glass bottles and aluminum cans. The inside diameter measures 2.75 inches by 2.75 inches deep.