Screw top GC vial-Aijiren Vials for HPLC/GC18mm Screw Magnetic Precision Caps for GC Vials The optional capacity is 10ml 20ml and the specifications are 22.5 x 46mm, 22.5 x 75.5mm Material: USP Type 1, Class A, 33 Borosilicate Glass Dimensions: 22.5 x