Aijiren Hand Decrimper is designed to unseal sealed Crimp actis. Aijiren offers Crimp neck actis in two sizes. One is Crimp Neck actis with a diameter of 11mm. One is the Crimp Neck Headspace Vial with an opening diameter of 20mm. For both types of Crimp Neck Vial, Aijiren has matching opening sizes of Hand Crimper and Decrimper for customers to use. If you need to purchase Crimp Vial, it is recommended that you purchase Hand Crimper and Decrimper together.