Features: 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 Item Type: Back Support Plate Material: Metal Color: Black Function: 3D Printer Accessories Application Scope: For Ender?3 V2 Package Included: 1 x Back&nbspSupport&nbspPlate