网页Description. Narrow neck vial w/8-425 thread finish. High quality 33 expansion borosilicate glass or amber 51A glass. Uniformly flat bottom for security with inserts. I-D™ vials feature write-on patch with graduations at 0.5, 1.0 and 1.5mL. Glastic vial features a glass insert pre-inserted inside of a clear TPX vial.