Manufactured from superior quality 33 expansion borosilicate clear (Type 1, Class A) glass, Thermo Scientific™ National™ 13mm Snap/Crimp Vials features a 13mm crimp/snap-ring finish for use with 13mm Aluminum Seals or Kim-Snap Closures. Polyspring inserts are self-aligning and provide a cushion against needle contact. Product Size.