Grace 2109159. Often Purchased with: 2.0 mL, 11 mm Poly Crimp-Top/Snap-Top Caps and PTFE/Butyl Rubber Septa, Clear, 100-pk. 2.0 mL, 11 mm Aluminum Crimp-Top Seals with PTFE/Silicone Septa, Silver, 100-pk. 2.0 mL, 11 mm Aluminum Crimp-Top Seals with PTFE/Natural Rubber Septa, Silver, 100-pk. 21153. Glass.