Vials. 2.0 mL, Clear glass, 6.0 mm opening, crimp top 40mL (10.7 drams). 29 x 81mm 40mL. 27521. 2mL Large Opening Vials with Open-Top Screw Caps. 2ml crimp neck ND11 vials, 11mm Larger opening than standard narrow opening vials by 40%, prevents syringe problems; The special design ensures a consistent seal.