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【Material】 Material: aluminum alloy; Surface Treatment: anodizing 【Widely Used】widely used for Creality CR-10,Ender 3 【Install】Already assembled,you don't need to assemble it by yourself 【Function】you can adjust the belt freedom, more better than original 【Package Include】1kit X-axis Synchronous Belt Stretch Straighten Tensioner, 4pcs M4 T Nuts, 4pcs M4x8mm screws