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MATERIAL: Mold spring is mainly used for mold machinery. Made of high quality 65 manganese steel, high strength, high hardness, high temperature resistance, high rigidity and long service life. FEATURES: This mold spring has a rectangular cross-section, which is stronger than normal springs, which helps your 3D printer to be more stable when printing. SIZE: hole diameter (outside diameter): 10mm; rod diameter (inside diameter): 5mm; length: 30mm; load level. Light load. BLUE LIGHT LOAD: The load level of the die spring is yellow, blue, red, green, and brown from the lightest load to the super heavy load. For die springs, the blue color represents the load level is light load. APPLICATIONS: Widely used in stamping dies, metal die-casting dies, plastic molds and other precision mechanical equipment with elastic movement, automobiles and other fields.