roduct Information - You receive 200 Pcs of flip off caps for ample supply. The caps have an inside diameter of 20mm/0.8 inch; an outer diameter of 22 mm/0.9 inch; a height of 8.6mm/0.3 inch Material - The cover is made of good aluminum and plastic, smooth and burr-free after opening, offering a secure seal for glass vials. How to Use - To open, flip off the plastic cap and remove the aluminum seal using pliers if necessary. The flip off seal can withstand high temperatures. But this cover is fully tear-off, and when you tear off its plastic cover, the aluminum cover becomes unusable. Good Seal - The equipped plastic-aluminum lid ensures the tightest seal and reduces the possibility of sample evaporation. This crimp top vial provides a good seal for long-term sample storage. Application - The Flip Off Caps can be used in the laboratory and , with a good sealing effect and convenient storage. Suitable for oral liquid bottles, original solution bottles, essential oil bottles, freeze-dried bottles, etc. Colour: Red Specification: 20mm Material: Plastic + Aluminum Package Contents: 200 x Vial Flip Off Caps Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.