Note: Before buying, please check the size of your cup and the cover.<br> You could also compare the size of your own cup lid with our lid size to make it easy to confirm whether it fits your cup.<br> This tumbler lid is specially design for Yeti Rambler, Old Style RTIC, Ozark Trail and most other 20 oz tumblers or cups, prevents any spill of drinks.<br> Note: The new RTIC glass introduced in 2016 is not suitable for this product.<br><br> Size: The bottom inside of lid measures 7.8cm/3.07inch. <br> The top of the lid measures 9.5cm/3.74inch. <br> The top of lid that sits at run measures 8.6cm/3.38inch. <br> Note: The new RTIC glass introduced in 2016 is not suitable for this product.<br><br>