Glass Erlenmeyer Flask Set, Conical Lab Bottles with Stoppers, Glassware
Silicone Stoppers Suitable for holes: 16-18mm,18-22mm, 21-25mm, 24-28mm, 27-31mm, 30-34mm, 33-38mm, 38-41mm, 40-45mm, 44-49mm, 48-53mm. - Normal use: It can be useds to block glass mouth, pipe mouth, fish tank mouth, etc.