250uL Micro-Insert with Mandrel Interior & Polymer Feet, 29*5.7mm, Suits for 9mm Vials, Economy Package: C91: 9mm Black Screw PP Cap, 5.5mm Centre Hole: IV250: 250u1 Insert , Conical Bottom, 31*5.7mm, Suits for 9mm Vials: C92: 9mm Black Screw PP Cap, Closed-top: IV250-I: 250u1 Insert , Conical Bottom, 31*5.7mm, Suits for 9mm Vials, Economy