2mL TITESEAL® Clear N51-A Borosilicate Glass Shell Vials with Unattached White Polyethylene Plug Style Needle Closures. Closures are not attached. Economic alternative to aluminum seal, crimp/snap-ring, and screw thread finishes. Shell vials are made from Type 1, Class A, KG-33 borosilicate glass. Capacity: 2mL. O.D. x L: 12 x 31mm. 200/Pack; 5 Packs/Case. Kimble® #: 60831D-1231.