3. HPLC Micro-Inserts for 10 -425 HPLC Vials. There have five types of HPLC Micro Insert suitable for 10-425 hplc vials,I300 300uL with Flat Bottom,IV250 250uL Conical Micro-Insert,IP250 250uLMicro insert with Mandrel Interior & Polymer Feet,IV250-I (Economy), and IP250-I (Economy).