Caps are molded to ensure consistency in fit, thread specifications and overall dimensions. 12 x 32 mm, 9 mm thread, unassembled, pkg of 100 volume 2 mL, amber glass vial (with graduated marking spot), PTFE/silicone septum (with slit), (septa bonded to cap) pricing. Certified Snap Top Clear Glass Vial Kits ... Sigma-Aldrich Products are ...