DWK Life Sciences (Wheaton) Glass Flat Bottom Vial Insert, 0.35 ml. Vial Insert, 0.35 ml, Borosilicate Glass, With Flat Bottom, Limited Volume Inserts, Use with DWK Life Sciences (Wheaton) ABC Screw Caps. Vial Insert, 0.35 ml, Borosilicate Glass, With Flat Bottom, Limit More SECO Part #: DWK-225350-631.