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Description: 1.Made from Steel, which makes it have a higher hardness than plastic ones. 2.To prevent a joint from separating during a reaction process, the clips can be used to secure the two sides together. 3.Widely used on expert or beginner scientific labs. Specifications: Top Opening Width: 25mm / 0.98 Inch Top Inner Diameter: 30mm / 1.18 Inch Bottom Opening Width: 29mm / 1.14 Inch Bottom Inner Diameter: 35mm / 1.38 Inch Overall Size: 50x18mm / 1.97*0.71 Inch (D*H) Weight: 7g Package Content: 1 x Joint Clip