Features: Brand new and high quality The parts are processed using CNCtechnology, which can better improve compatibility with the machine and prevent bending. The machine on which this upgrade package is installed has undergone long-term testing and has greatly improved stability and printing accuracy, allowing for long-term printing. Kit upgrade kit accessories, providing reserved interfaces for dualZ screw upgrades, making it easier to upgrade the dualscrew solution by providing the necessary screw tools. Tighten the screws and install them on the printer, make slight adjustments, and after debugging, the printer can be upgraded. Two line guides are required for upgrading. Compatibility for Ender3, Ender3V2, Ender3Pro, Ender33S. Specifications: Material: Metal Style: Without LeadScrew , with LeadScrew (optional) Line guide rail size: MGN12H-300mm Compatibility: for Ender3, Ender3V2, Ender3Pro, Ender33S Note: No retail package. 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 Double ZAxis Kit