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Please contact us for refund or replacement if the items are shattered during transportation.500ml Glass Filtering Flask with Upper Tubulation. It is perfect for education, research, testing and other non-medical use. For the tubulature of filtering flasks of 500ml, the inner diameter of the end is about 0.40cm, the outer diameter of the end is about 0.90cm; the length is about 3.00cm. #6 rubber stopper works with filtering flasks of 500ml. For #6 rubber stopper,the diameter of top is about 3.50cm, the diameter of bottom is about 2.50cm, the height is about 2.80cm.