Feature: 1. INCLUDED TOOLS: 3D printer upgrade kit, including aluminum plate accessories, screw accessories, timing belts and guide rails for easy installation and replacement. 2. APPLICABLE MODELS: This upgrade kit is suitable for Ender 3 pro 3D printers and is compatible with Ender 3 Pro V2, with standard size and strong compatibility. 3. WITH GUIDES: The linear guide is made of excellent material, with a length of 300mm, wear resistant and durable, has single slide block for easy operation. 4. EASY TO INSTALL: With precise drilling technology, these accessories can be perfectly mounted on 3D printers and can ensure stable operation for a long time. 5. ALUMINUM ALLOY: Made of excellent aluminum alloy material, light weight and corrosion resistance, these tools have good heat dissipation and long service life. Specification: Item Type: 3D Printer Upgrade Kit Material: Aluminum Alloy Guide Rail Size: Approx. 300mm / 11.8in Applicable Model: For Ender 3 Pro and for Ender 3 Pro V2 3D printer . Package List: 16 x Aluminum Plate Accessories19 Packs Screw Accessories (141Pcs in Total)2 x Shaft Belts4 x Guide Rails 300mm (With Single Slider) Note: Pay attention to the correct operation.