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The American Educational 7-G47 support ring and clamp is for holding laboratory glassware and other items on a ring stand. This item is constructed of cast iron for durability and acid-resistance. The thumbscrew in the clamp locks the ring tightly to a support stand. The ring has a 4" outside diameter.American Educational Products manufactures learning materials in math, science, and reading/language arts for students in pre-kindergarten through grade 12. The company, founded in 1986, is headquartered in Fort Collins, CO.