Qorpak GLC-05184 Borosilicate Glass 40mL Clear Type I Screw Thread Vial, with Black PP Cap and PTFE Disc Attached, 29.25mm Diameter x 81mm 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 Vials are fully assembled and ready for your own cleaning procedure Measures 29.25 millimeters diameter by 81 millimeters height