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Package: 20x Torsion Springs ( 10x6mm spring + 10x10mm spring ) It Is Used to Tighten the Timing Belt of 3D Printer. Tensioner Springs Are Effective Way to Get Rid of the Problems with Adjusting Correct Tension in Your DIY 3D Printer / Cnc Timing Belt System. Use Elastic Steel Material, Corrosion Resistance, Fatigue. Convenient Installation: The Timing Belts Torsion Spring Is Easy to Install and Disassemble. It Can Be Used for a Long Time Without Any Tools, Which Is Very Convenient.