IP250-I(Economy) Description 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