Secure the contents of your mini jars with a mini lid. The screw-on lid is a single piece and not two parts like the traditional mason jar lids used for canning. The small silver tin metal lid has a diameter of 1 7/8”, perfect for our 4 oz. mason jar shot glasses. It’s a cute, inexpensive add-on. That way, you can prefill the small, handled mason jar glasses with a signature shot for your party guests or use the mug style shot glass as a miniature favor container.