2 Pieces 18 mm by 14mm Stem Glass Tube Adapter Clear Scientific Tube Adapter for Science and Lab Experiments -5 Inch-

Features: Easy to use: These scientific glass tubes are easy to use, you can directly use them for lab and science experiment, and you will receive comfortable and pleasant experience during the using process. Safe package: The glass adapter is packaged with foam, which makes sure the glass tube not to break during the process of transportation, and you will receive the complete product. Specifications: Material: thick glass Quantity: 2 pieces Color: transparent Size: 18 mm to 14 mm, 13 cm/ 5 inch in length Package content: 2 x Scientific glass adapters Warm notice: Please allow slight size error due to manual measurement. Each glass tube is equipped with independent foam packaging.