300uL Micro-Insert, 31*6mm Clear, Flat Bottom, Suits for 10-425 Vials 250uL Conical Micro-Insert, 31*5.7mm, Suits for 10-425 Vials 250uL Micro-Insert with Mandrel Interior & Polymer Feet, 29*5.7mm, Suits for 10-425 Vials. Micro-Inserts--Aijiren HPLC Vials. Description Micro-Inserts from Aijiren Technology, Inc with high quality and favorable price.