Material: 3D Printer belt tensioner Made of good quality Aluminum Alloy, Surface oxidation treatment,durable, 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