All metal material Accepts rods up to 3/4" in diameter Center adjusts to allow for different angles other than perpendicular Perfect universal lab clamp - accepts rods up to 3/4" in diameter Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.