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The Bel-Art Scienceware 183070005 round vinyl-coated lead ring is used to stabilize and weigh down Erlenmeyer-style flasks in water baths to reduce breakage and prevent floating and spilling. Vikem vinyl-coated non-slip surface seats securely around the neck of the flask, and is cushioned to prevent scratching. The ring fits 125 to 500mL Erlenmeyer flasks, has a 3.0" (76mm) outside diameter (OD), a 1.7" (43mm) inside diameter (ID), and an approximate weight of 0.5lb. (237gr). 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.