VWR Spinbar Stir Bars Round. Pivot rings minimize the contact area of the bar to the vessel reduces friction and lessens marring of plastic containers (7.9x12mm and 7.9x19mm models have no pivot ring). Smooth running surfaces minimize edge banding and banding on larger bars. Floating rings at both ends of the bar add stability without adding swing. As with other Bel-Art products quality control checks ensure that Bel-Art VWR Stirring Bars offer the consistency required for accurate temperature measurements. For this reason they are often used in higher temperature applications. Manufactured and packaged with extreme care in the U.S. and other countries. Specifications for VWR Spinbar Stir Bars Round 371115008 : L x Dia. mm (in.): 19.0 x 7.9 (3/4 x 5/16) (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Bel-Art products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Laboratory Apparatus with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for VWR Laboratory Apparatus. 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 VWR Spinbar Stir Bars Round 371115008/ 58948-956 we carry a full complement of Laboratory Apparatus as well as other product offerings from Bel-Art. We also carry a full line of VWR accessories to help meet your laboratory and scientific needs. For a complete selection of VWR Laboratory Apparatus please visit our Bel-Art page. For more brand name Laboratory Apparatus please visit our Laboratory Apparatus store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. VWR Spinbar Stir Bars Round 371115008