The 7 x 40 mm size is designed to work with: Phillips S4, S8, 4100; Beckman 504; SGE LS-2300, and other similar autosamplers. The 8 x 30 mm size is designed for use with Perkin-Elmer, Sigma 2000 and other similar autosamplers using 60 position carousels. The 12 x 40 mm size is designed for use in Fisons Instruments AS 800, ICI Instruments LC1600, Pharmacia LKB 2157-020 and Tekmar Liquitek 90. Choose from clear KG-33 borosilicate glass or amber 203 borosilicate glass. Crimp top. Without closure.