30 pack of 30mL high quality glazed porcelain crucibles with lids. Great for heating chemical compounds in the lab and withstands temperatures of up to 1900°F (1050°C). 2" diameter x 1.25" height Just the crucible. HT 30 mm OD 50 mm ID 45 mm Bottom 20 mm Lid OD 60 mm ID 56 mm HT 23 mm Over all it is 40 mm tall. The maximum temperature up to which these can be used is 1000 degree C; the recommended rate of heating and cooling should NOT exceed 200 degree C per hour .