40% larger opening prevents broken needles due to increased target area. Neck finish allows use of patented Poly Crimp Seals™ or standard aluminum seals. Designed to work in Agilent and other autosamplers. Choose from clear or amber Type I borosilicate glass. ID design incorporates the StepVial feature that precisely centers a limited volume insert in the vial neck. Available with graduated marking spots which can be written on with a #2 pencil.