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【CORK MATERIAL】- The laboratory flask cork stand select high-quality, environment-friendly and high-density synthetic cork. 【FEATURE】- Acid and alkali resistance, corrosion resistance, heat resistance, heat insulation. 【SPECIFICATION】- Outer diameter: 160mm/6.3in; Height:30 mm /1.2in 【HIGH STABILITY】- Good elasticity,strong friction coefficient,make sure the flask can place stably. 【APPLICATION】- The flask holder is pressed by high temperature and pressure. Suitable for all kinds of round bottom glassware, convenient and practical.