Features: brand new and high quality Compatible: Twotrees official extension upgradekit, for Twotrees TT-5.5S, TTS-55, TTS-25, but not TT-2.5, TT-5.5. Greatupgrade of the working area: The working area of the engraving machine is expanded from 300x300mm to 420x400mm, and the working area is increased by 86.6%, which can engrave larger projects. Newupgrade: The aluminum frame of 2 Y axis and X-axis adds digital scale, making it easier to measure engrave objects. The added corrugated tube makes the cable neater and safer. Package includes: 2 Y axis aluminum extrusions, 3 X-axis aluminum extrusions, extension cables, timing belts, cable tie, bellow, bellow brackets, screw kits, tool kits. Theupgrade of the engraving machine can be completed without purchasing other parts. Note: TTS-25 and TTS-55 can directly replace the extension cable. TTS-5.5S needs to modify the cablesequence before replacing the extension cable. Specifications: Material: metal Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x 400x420 Engraving Area Expansion Kit