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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: 17mm / 0.67 Inch Top Inner Diameter: 20mm / 0.79 Inch Bottom Opening Width: 24mm / 0.95 Inch Bottom Inner Diameter: 27mm / 1.06 Inch Overall Size: 39x17mm / 1.54*0.67 Inch (D*H) Weight: 4g Package Content: 1 x Joint Clip