Aijiren 0.25 mL Vial Inserts, Glass, Flat Base - amazon.com. 0.25mL Vial Inserts Glass Flat Bottom Clear Insert Tube for 8-425 Vials, 100 pcs/pk Material: USP Type 1, 68 Borosilicate Expansion, 1st Hydrolytic, Clear Glass Dimensions: 31 x 5 mm Fill vol: 0.3ml ,Usable vol:0.25ml Content: 100 pcs/pk. Send Inquiry.