Vials, LC, 4mL Clear Glass with Screw Cap and Pre-slit Septa, 100/pk 4 mL, 15 x 45mm clear boroscilicate glass vial. 100/pk. Includes caps with pre-inserted, pre-slit Teflon/silicone septa. Use with the following autosamplers and racks: SIL-20A/AC, SIL-30AC