250uL Micro-Insert, Flat Bottom, Clear, 31x5mm for 8-425 vials, 500/pk View Details 250uL Micro-Insert with Mandrel Interior and Polymer Feet, 29x5.7mm for 9mm vials, 200/pk TSH-CV2042 250uL Micro-Insert with Mandrel Interior and Polymer Feet 250uL Micro-Insert, Flat Bottom, Clear, 31x5mm for 8-425 vials, 500/pk. View Details.