This item sold on November 20, 2012.
(2) 20 mm
The stringing holes are all approx. 1 mm.
I have discovered over time that each batch of beads fires in the kiln differently depending on the season, temperature, and humidity, and barometric pressure.
--------Inches -vs- Millimeters----------
1 inch = 25 mm
1/2 inch = approx. 12 mm.
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