Ortur Extension Kit for Laser Maser 3 Series Laser Engraving Machine Expand Working Area to 400mm*850mm (ETK2.0)Extension Kit Features High Accuracy and Stability, Adopting durable aluminum alloy material, with the structural design of steel wheel and synchronous Belt, it is stable and accurate even at a working speed of 200mm s and a large area. Higher Working Efficiency, Ortur Extension Kit for Laser Master 3 expand Your Working Area to 400mm*850mm. The large working area allows you to set more quantity at one time to achieve higher working efficiency.