1 x 250uL Micro-Insert with Mandrel Interior and Polymer Feet, 29x5.7mm for 9mm vials, 100/pk, CV2044 + $16.38 1 x 250uL Micro-Insert, conical bottom, 31x6mm for 9mm vials, 100/pk, CV2046 + $10.96 1 x 300uL Micro-Insert, Flat Bottom, Clear, 31x6mm for 9mm vials, 100/pk, CV2050 + $6.19 Micro-Inserts--Aijiren Hplc Vials Insert