Aluminum crimp seal (without septum), silver aluminum removable center, 13 mm, diam. × opening 13 mm × 6.4 mm, for use with 2 mL - 2.5 mL standard opening crimp top vials, pkg of 100 ea: 27227-U: Aluminum crimp seal (without septum), silver aluminum removable center, diam. 20 mm, pkg of 100 ea: 27228: Crimp seals with PTFE/rubber septa