Bamboo Mason Jar LidA handmade, bamboo lid that provides perfectly smooth snap on action for your mason jars! Great for bringing your beverages on the go, having a cocktail at the beach, and for children to enjoy juice without spilling it! Turn any regular mouth or wide mouth mason jar into a tumbler. The diameter of the straw hole is 0. 55 inch and works with most re usable straws (yes, even Boba straws!) Wide Mouth Lid: Top diameter is 3. 37 inches. Regular Lid: Top