The below measurements are approximate:
- The 7mm diameter measures 10.5mm tall by 10mm wide
- The 8mm diameter measures 11.5mm tall by 11.5mm wide
When opening seam rings for insertion, it is
best to twist the two ends away from each other rather than opening the
ring as one would do with a standard captive bead ring. The second
method will distort the shape of the ring.