Features: High quality aluminum alloy material, wear-resistant and deformation resistant. Surface- anodizing treatment-.Fine workmanship, wear-resistant and corrosion-resistant 4040 aluminum profile Y-axis- synchronous belt stretching fit for Ender3 -V2 Ender3pro ENDER-3S CR20 3d printer 2020 X-axis belt tensioner suit to CR10/CR-10S/CR10-S4/CR10-S5/CR10 mini/CR10 -V2/CR10 -V3/CR-10S-Pro/CR-10S -Pro -V2/CR10 -Max/CR-X-/CR-X-Pro-/CR-6SE/Ender-3/Ender-3Pro/Ender-3 -V2/Ender-5/Ender-5-Pro/Ender-5Plus/SV01/SV02. 2040 Y-axis- belt tensioner is only suit to Ender3,not for Ender3Pro. Specifications: Name: 2020/2040/4040 aluminum profile X-axis Timing belt stretching Material: Aluminum alloy Surface-treatment-: anodizing Item Type:2020 X-axis/2040Y-Axis-Ender/ 4040Y/ 2020X and 2040Y/ 2020X and 4040Y/ 2040Y-aix CR10 Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PCS Belt Stretching Tensioner