Qorpak GLC-00983 Borosilicate Glass 4mL Clear Type I Screw Thread Vial, with Black Phenolic Pulp/Vinyl Lined Cap, 15mm Diameter x 45mm Height (Case of 144) Clear screw thread vials offer maximum visibility Product allows users to properly secure closures at the correct degree of torque to ensure a proper seal Providing exceptional resistance to heat shock and chemical leaching Attached black phenolic (thermoset) caps with pulp/vinyl liners are perfect for general use Measures 15 millimeters diameter by 45 millimeters height