Crimp Caps ND11) Precision Thread ND18 for Headspace and SPME HS Crimp Neck (Bevelled Top Headspace Crimp Neck) DIN Crimp Neck (flat Crimp Neck) Fire-Polished Neck (Shell Vials) Snap Cap Neck (Sample storage containers, no autosampler vials) Special Neck for SPME Vial (thicker Crimp Neck) Design of the Bottom flat bottom rounded bottom (HS-bottom)