China IP250 micro insert vial manufacturer Micro-Inserts-Aijiren Vials With Caps IP250-I(Economy) IP250 Description 300uL Micro-Insert, 31*6mm Clear, Flat Bottom, Suits for 11mm Snap Ring Vials 250uL Conical Micro-Insert, 31*5.7mm, Suits for 11mm Snap Ring Vials 250uL Micro-Insert with Mandrel Interior & Polymer Feet, 29*5.7mm,