Aijiren's Glass Vial with Crimp Caps adopts Caps made of Aluminum, which ensures good sealing performance when used with Hand Crimper and Decrimper. Crimp Vial of different calibers needs to be used with different Crimper specifications. For example, if the mouth of 2ml crimp top hplc vial is 11mm, you need to use 11mm Crimper and Decrimper.