Description: Graduated glass erlenmeyer flask: - Made of high quality borosilicate glass. - Thick walls and bottom provide strength and durability. - The wide-bottomed narrow-bore design provides the right balance between mechanical strength and thermal shock resistance. - Thermal and thermal shock resistance Graduated Glass Erlenmeyer Flask Size: (Approx.) 50ml: Height: 88.5mm/3.48"; Bottom Diameter: 52.5mm/2.07''; Bore Diameter: 22mm/0.87'' 100ml: Height: 105.5mm/4.15"; Bottom Diameter: 65.5mm/2.56''; Bore Diameter: 24mm/0.94'' 150ml: Height: 115.5mm/4.56"; Bottom Diameter: 69mm/2.72"; Bore Diameter: 26mm/1.02'' 200ml: Height: 131mm/5.2"; Bottom Diameter: 75mm/2.95"; Bore Diameter: 26mm/1.02'' 250ml: Height: 155mm/6.1"; Bottom Diameter: 81mm/3.19"; Bore Diameter: 30mm/1.18'' Silicone Stopper: - Not easy to deform, moderate hardness, manufactured according to standards and materials - High elasticity, good insulation and sealing performance, high temperature resistance, acid and alkali resistance, insoluble and non-swelling in acidic liquids. - Normal use: It can be used to block glass mouth, pipe mouth, fish tank mouth, etc. Silicone Stoppers Suitable for holes: 15-18mm,18-22mm, 21-25mm, 24-28mm, 27-31mm, 30-34mm, 33-38mm, 38-41mm, 40-45mm, 44-49mm, 48-53mm, 56-68mm Package includes: According to your choose. Note: 1.Please allow 1-2mm differs due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, Thank you! 【Feature】- Made of high quality Borosilicate glass, Uniform wall thickness. Clear and accurate scales for you to measure liquid and approximate contents efficiently.; Reusable, environmental friendly, will not shatter easily, easy to clean, high temperature resistance. Silicone Stoppers are made of high-grade materials to ensure their safety and durability; small in size and light in weight, suitable shape allows for easy insertion and removal, convenient to store and use. 【Safe & Durable】- Offering superior heat, chemical and thermal shock resistance. These Borosilicate Glass Erlenmeyer Flasks have High chemical durability and low thermal expansion, which can withstand the temperature under 800 °C (~1500 °F). The Erlenmeyer Flask Stoppers are High elasticity, good insulation and sealing performance, high temperature resistance,acid and alkali resistance, will not dissolve and swell in acidic liquids 【Application】- This narrow mouth conical borosilicate glass flask is ideal chemistry glassware for use in liquid measuring, laboratories, science experiment, schools, and for home, etc. These Silicone Stoppers are perfect for test tubes, flasks, and other bottles that require a secure seal. Can be used to block glass ports, pipe mouths, fish tank openings, etc. 【Package Included】- According to your choose.