The Bel-Art Scienceware 187882001 Steel poxygrid half-size wire test tube rack holds 20 18 to 20mm test tubes in classroom and laboratory settings. The blue epoxy-coated steel wire construction is chemical and corrosion resistant, and is impervious to organic solvents, salts, weak acids, and weak alkalis. The rack withstands temperatures from -369 to +250 degrees F/-223 to +121 degrees C and is autoclavable. The half-size rack is designed for use in small places including water baths, under fume hoods, and other limited space locations. It is 4.25 x 4.9 x 2.44 inches/108 x 125 x 62mm (H x W x D). (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.)Bel-Art Products manufactures scientific products, including labware, testing equipment, and safety supplies, under the Bel-Art and Scienceware brands. The company, founded in 1946, is headquartered in Wayne, NJ. 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.