Glass Vials 10 ml and 20 ml Crimp Neck Content: 100 pcs. / pack. magnetic bi-metal cap 8 mm centre hole; silicone blue /PTFE transparent; UltraClean; recommended konik autosampler vials. 0.8 mL vials using 8 mm crimp caps (171 vial tray). For GC and LC modes AS Magnetic cap 20 mm Vials have rounded bottoms and 18 mm diameter necks.