Inserts for 2.0 mL, 11 mm Crimp-Top, 2.0 mL, 9 mm - Restek Catalog # 21777 Material Glass Units 1000-pk. Volume 250 µL Modification w/Bottom Spring Used with 2.0 mL, 11 mm Crimp-Top Vials|2.0 mL, 9 mm Short-Cap, Screw-Thread Vials|2.0 mL, 10 mm Big Mouth Step Design Screw-Thread Vials