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The quantity is counted by people, if the quantity less 20, please contact us, we could resend new 1 pack product to you. Rectangular section, closed-end design. Die springs are primarily used in die machinery, For Plastic Injection.The loading grade of die springs in various colors (from lightest load to extra heavy load): yellow, blue, red, green, brown. In addition, because die springs are well suited for high stress applications, they are also suitable for a variety of other applications as well. FAQ: What is Hole Dia? What is Rod Dia? Hole Dia: The Diameter of the Hole on the Mold ,i.e.the Outer Diameter of the spring. Rod Dia: The Diameter of the Rod that is to be inserted into this spring, i.e.the inner Diameter of the spring.