Neck finish allows use of Snap Top Caps™, patented Poly Crimp™ Seals or standard aluminum seals. Snap Ring™ finish eliminates the need for crimping or decapping. Designed to work in Agilent and other autosamplers. Choose from clear or amber Type I borosilicate glass. ID design incorporates the Step Vial feature that precisely centers a limited volume insert in the via neck. Available with graduated marking spots which can be written on with a #2 pencil.