Sep 23, 2019 · Screw, Crimp and Snap top vials with caps and septa are all available. Micro-Inserts & Shell Vials available in 0.15ml,0.25ml, 0.3ml,1ml. HPLC Auto-sampler Vials Review: 8mm Screw Top Vials: 8mm (8-425) screw thread vials are the original smaller opening autosampler vials.