Label . No. Thread Size . 13-425 Thread. Vial Width . 15mm. 4ml Clear screw top vial 15 x 45mm. Unit/Measure. PK/1000 Part Autosampler Vials,Headspace Vials,Chromatography Vials These 4mL (13mm) 15 x 45mm vials are manufactured from superior 51A amber (Type 1, Class AB) or clear glass and feature a 13-425 thread finish.