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] Made of high quality of metal, this back support plate is sturdy, 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 V2Specification:Item Type: Back Support PlateMaterial: MetalColor: BlackFunction: 3D Printer AccessoriesApplication Scope: For Ender‑3 V2.Package List:1 xBack Support Plate