National Scientific Wide Opening Crimp-Top Vials National Scientific Unassembled Vial And Crimp Seal Convenience Kits Clear Target Vials Case. Thermo ScientificTM Wide-Opening Crimp-Top Vials feature a crimp-seal closure designed for excellent product recovery and long storage stability. Flat-bottom design provides a large worksurface and good mechanical adherence. Large-mouth opening makes it easier to fill vials to desired level. The wide mouth design provides good aspiration of both liquids and gases. Vials are molded from natural unlined glass. Large-mouth vials have a reinforcing rib across the top of the neck. Large-mouth vials can be topped or crimped after filling. National Scientific Wide Opening Crimp-Top Vials National Scientific C4011-88 Unassembled Vial And Crimp Seal Convenience Kits Clear Target Vials Case