Kimble/Kontes Test Tubes with Flat Head ST Stopper KONTES. The ST shape allows use with or without a centrifuge and with or without a centrifuge jar for isolating or weighing liquids or powders. Large ST-shaped stoppers accept standard lab-top or narrow-mouth funnels with pin holes making use of the flat head more convenient. Large ST-shaped stoppers have a tapered tip to fit firmly in the funnel or tube eliminating funnel backs and reducing the chance of slipping. Stoppers are fitted with a single large flat head ST-shaped stopper with a large "s" shaped bevel to fit tightly in the funnel or tube. Large ST-shaped stoppers have a tapered tip to fit neatly into the funnel or tube stack. Large ST-shaped stoppers have an enlarged tip to better fit into the funnel or tube stack increasing the volume of liquid that can be added without a funnel. Bead wire forming method provides an effective method of closing a test tube without a needle or plunger. A "U" shaped stopper is inserted into the large end of the test tube beneath the stopper and sealed with a rubber or plastic plug. Large tubes have a wide mouth providing for many useful filling or dispensing options. A funnel or tapered stopper may be used to make an alternate ST stopper. These test tubes feature a polished finish thicker mouth and are shatter resistant as no breakage will occur during blowing. Flat-head ST stoppers are commonly used with acids alkalis or alkalis. Test tube liners are easily removed by hand with no special tools required. Specifications for Kimble/Kontes Test Tubes with Flat Head ST Stopper KONTES 898000-0005 : Size O.D.x Lmm: 13 x 80 VolumemL: 5 ST Stopper Size: 9 Unit: Each (5 ML) (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Kimble/Kontes products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Beakers Test Tubes Flasks & Accessories with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for Kimble/Kontes Beakers Test Tubes Flasks & Accessories. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the Kimble/Kontes Test Tubes with Flat Head ST Stopper KONTES 898000-0005/ KT898000-0005 we carry a full complement of Beakers Test Tubes Flasks & Accessories as well as other product offerings from Kimble/Kontes. We also carry a full line of Kimble/Kontes accessories to help meet your laboratory and scientific needs. For a complete selection of Kimble/Kontes Beakers Test Tubes Flasks & Accessories please visit our Kimble/Kontes page. For more brand name Beakers Test Tubes Flasks & Accessories please visit our Beakers Test Tubes Flasks & Accessories store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. Kimble/Kontes Test Tubes with Flat Head [ST] Stopper KONTES 898000-0005