Feature: 1. [Introduction] This is a V solt aluminum extrusion frame 3D printer extruder back support plate, well designed, easy and convenient to install. 2. [Sturdy Durable] Made of high quality of metal, this back support plate is sturdy and durable, which is the perfect upgrade part of 3D printer. 3. [Pulley Size] The pulley diameter is 24mm / 0.9inches, and the pulley height is 11mm / 0.4inches, you should choose the right proper size. 4. [Application] The accessory is suitable for 2020 V series aluminum profiles, adjust the sliding smoothness by adjusting the hex eccentric column. 5. [Compatibility] With a wide compatibility, the back support plate is compatible for Ender‑3 V2 How to Use: Replaceanduse Specification: Item Type:BackSupportPlate Material: Metal Color: Black Function:3D Printer Accessories Application Scope: ForEnder‑3 V2 Package List: 1 x BackSupportPlate.