Vials, screw top, clear glass (vial only) , thread 24-400, Vials, screw top, clear glass (vial only); Autoclavable, easy to maintain. A vial is used to store or as a closure type. 27186 Screw cap, solid top with PTFE liner, pkg 100, green melamine resin solid cap, F217/PTFE liner, for use with 20 or 40 mL vial with 24-400