Top/Cap Type 20mm Crimp Top / Beveled Parts:Vial Vial Volume (ml)20 Max Vial Volume (ml)23.5 Color:Clear Vial Diameter:28 / 0.3mm Vial Height:55 / 0.7mm Screw Diameter: 19.6 / 0.25mm Mouth Diameter: 16 / 0.25mm Base Thickness:0.7 / 0.2mm 20mm Silver Crimp Tops 20mm Black Flip Off Caps: OR Grey Butyl Rubber Stoppers: Vials are shipped empty, not sealed or sterilized. Pictures shown are what the fill line looks like.