Size:1 x 1/4" (25 x 6 mm) Size:1 x 1/4" (25 x 6 mm) Plastic container surfaces are less prone to being scratched or marked by the spinning bar. Multifaceted surface transfers more torque to the liquid being stirred when compared to non-faceted cylindrical stir bars of the same size. Features center molded pivot ring for reduced friction and chattering. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.