Zeberoxyz Upgrade 4020 Profile Y axis Synchronous Belt Stretch Straighten Tensioner for Ender 3 Auminum Extrusion 40x20mm 3D Printer Parts (4020)

Material: 3D Printer belt tensioner Made of good quality Aluminum Alloy, Surface oxidation treatment,Sturdy, fine workmanship Easy to Install: 4020 aluminum extrusion belt tensioner already assembled,you don't need to assemble it by yourself, No need to change the original belt length,direct installation and ready to use Function: you can adjust the belt freedom, more better than original, it will not reduce the Y-axis stroke of the original 3D printer Widely Used: widely used for 3D Printer ender 3 upgrades Series Package Content: 1Kit 4020 Aluminum Extrusion Profile Y-axis Synchronous Belt Stretch Straighten Tensioner, 4PCS M4 T-Nuts, 4PCS M4x8mm Screws,2PCS Allen Key