1. Product Name: fo Anycubi Kobra Double Z Kit 2. Applicable models: fo Anycubi Kobra 3. Main product size: screw length 350MM 4. Product features: This product has a significant effect on improving the performance of Anycubi Kobra models. 5. Packing list: 1 set Note: Since there are different versions of anycubi-kobra, this kit is only suitable for Kobra-Standard. (Earliest version, you could measure if your bearing rod was 350mm). This motor kit does not fit the Kobra Go and Kobra Neo versions, which require matching additional Z-height lead screws and T-nuts.