Screw top bottle DURAN® clear glass with pouring ring and PP screw cap, 50 mlScrew neck bottles, DURAN, transparent, w. pouring spout ring and cap, PP, 50 ml Material: DURAN glass. Autoclavable: yes. With DIN GL thread and pitch Bottles up to 25 ml, with a specially shaped glass edge, so no pouring ring is required Bottles from 100 to 2000 ml: ring shaped reinforcement in the bottles shoulder, shows the bottles nominal content With printed retrace code (batch code) Acc. to ISO 4796 1 Technical Information Vol. 50 ml external