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United Scientific Open Support Ring 3-1/4 in.
Product Number: NE30290
Grades 5 and up Support equipment and glassware in the lab such as test tubes, funnels, boiling flasks, and separatory funnels with a steel rod, zinc-plated extension support ring. The rod diameter is 7 mm and the straight rod portion of the ring is 71/4 in. long. Ring inner diameter is 31/4 in. and the gap width is 1.2 in.