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Materials:Made of good quality Aluminum Alloy, Surface oxidation treatment,Sturdy, fine workmanship Install:Already assembled,you don't need to assemble it by yourself,direct installation and ready to use Function:you can adjust the belt freedom, more better than original Widely Used: Widely used for CR-10 etc Package Content:1 Kit 2040 Profile Y-axis Synchronous Belt Stretch Straighten Tensioner, 4PCS M5 T Nuts, 4PCS M5x8mm Screws,1PCS Allen Key