I.D. vials feature a write-on patch with graduation for convenient sample 1.5mL. <170. C4013-1W. 100. Amber. No. 12x32. Flat. Bottom. 2.0mL. 1.5mL. CHROMATOGRAPHY SUPPLIES bi-metal magnetic crimp cap for easy crimping and decapping. Glass vials feature a graduated, write-on patch for convenient sample identification. WHEATON | Vial Guide