Bel-Art Spinbar Stir Bars Octagon. However very few have an interrupted surface increasing the stirring effect and turbulence. For this reason many stir bars have an interrupted surface. However very few are octagon which makes them even more widely used. Unlike cylindrical bars which have a smooth end the octagon ends of Spinbars have a machined end making for an easier stirring motion. Additionally the octagon ends of these stir bars have been drilled to allow for easy insertion of magnetic stir bars as well as for attaching a magnetic stir bar tether. Specifications for Bel-Art Spinbar Stir Bars Octagon 371105001 : L x Dia. mm (in.): 25.4 x 7.9 (1 x 5/16) Unit: Each (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 Bel-Art 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 Bel-Art Spinbar Stir Bars Octagon 371105001/ 58948-138 we carry a full complement of Laboratory Apparatus as well as other product offerings from Bel-Art. We also carry a full line of Bel-Art accessories to help meet your laboratory and scientific needs. For a complete selection of Bel-Art 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. Bel-Art Spinbar Stir Bars Octagon 371105001