250ul Micro Volume Insert,Clear Glass,Flat Bottom. For 8 . 250ul micro volume insert, clear glass, flat bottom. for 1.5ml lab amber vials for HPLC autosampler vials. Flat base Sample Vials. size 5.0x31mm. Standard Vials - 2mL | Shimadzu. 226-50523-00. Insert for 9mm, 2ml screw vials, 250ul, 6 x 29mm, precision point with spring, pk 100.