Conical Insert found in: Insert Glasses, Limited Volume Inserts, Limited Volume Vial Inserts, Microvolume Inserts For Wide Opening Vials, Conical Inserts,.. MACHEREY-NAGEL glass inserts are made from 1st hydrolytic class glass Small opening vials and inserts are more difficult to fill than wide opening sample containers Broad variety of different technical designs The longer the conical part