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The American Educational 7-911-A knife-edge clamp attaches to a meter stick (sold separately) to demonstrate force and equilibrium. It includes a removable stirrup to suspend weights. The steel construction provides durability and mechanical strength. It measures 3 x 1 x 1-1/4 inches (H x W x D) and comes in a package of five. (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.) 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.