This extension kit only includes the Y-axis extended profiles, upgraded T-slot Hybrid spoilboard, base frame and small parts that need to be replaced. (Masuter Pro CNC machine is NOT included) The 4080-extension kit is only for FoxAlien Masuter Pro CNC engraving machine upgrade. It can extend the working area to 15.75" x 31.5" (400mm x 800mm, X-Y). With this upgrade kit, Y-axis travel will double, and this will enable the CNC router machine to accomplish more large size projects such as making skateboard, guitar, and billboard etc. The upgraded hybrid spoilboard is compatible with hold-down clamps, FoxAlien mini vise. The base frame is strengthened by 2 aluminum profiles so that the spoilboard is steady enough for cutting and engraving. A detailed assembly guide is included. We provide step by step assembly manual. It is easy to install.