20mm Glossy Flip Cap Vial Seals, White, Bag 1000
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For use on serum vials with a 13mm hole opening and 20mm outer rim diameter.
No words or logos embossed in the cap to comply with USP regulations pertaining to ferrules (closures) on pharmaceutical packaging preparations. Center perforation of metal is already removed to ensure a smooth, uniform surface after removal of the plastic flip cap.
See the 2nd image for clarification