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To predict bottle neck diameter at the holes I measured the gap on all of the ones I have and got an average to work from. Then I 3D printed several iterations of the neck and settled on one that enabled being able to snap on the metal fitting without stretching it. That being said, the wire assembly is bendable and can be adjusted for size, so it can be made to fit a range of neck diameters.
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These enable a tight seal on glass jars. By using the 3D design and printing methods described on this site, slip-cast ceramic jars can be made to work with these.
Bail and latch fasteners have been used on glass jars since the late 1800s. They were supplanted by Mason jars (flat disk + screw band). But, the bail and latch design is still in use today because it is reliable, gives a nice airtight seal without needing complex parts and has decorative appeal.
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