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12Pcs Leveling 8mm Extruder Springs For 3D Printer Specifications: Diameter(OD): 4.8mm/0.19inch Length: 8mm/0.32inch Internal diameter: 3.20mm/0.13inch Material: stainless steel Good formability, homogeneous elastic. High plasticity, fatigue resistance, heat corrosion resistance. Environmental protection non-toxic pollution-free. Package included: 12 x 3D Printer Extruder springs