Custom crimp neck vial with writing space- Aijiren Crimp Vials 1.8ML Clear Glass Vial With Writing Patch (Pack of 100) Get Latest Price. Colpak 9mm screw thread vials have a 9-425 GPI thread and the closure is dimensionally equivalent to 11mm crimp cap vials.This means that they can be used in any autosampler that uses 11mm crimp cap vials. 9mm screw caps have an advantage over 11mm crimp caps because 9mm