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1.For :14/23 Outer Joint. 2.Material: Stopper made of high borosilicate glass. 3.Hexagon Head Stopper:Reusable, easy to clean, transparent, not easy to break. 4.Stable structure, groove design, easy to rotate, frosted with improved airtightness. 5.Suitable for Lab Glass Stopper,Boiling Flask-3-neck, Glass Bottle, etc.