Features: Upgrades your 3D printers with this Y rail kit for improved stability and motion. Maintain consistent height while improving stability use double rail system. Perfect for 3D printing enthusiasts who want to enhances their printing experience. Achieve better print quality and performances with this dependables kit. Note：These adapters require the MGN9H rail for 3D Printers The required length is 300MM. Specifications: Item：3D Printers Linear Rail Guide For3D Printers 3D Printers Guideway Length：about 30cm/11.8in PAckage type: A： Without Guide Rail/ B: With Guide Rail Package Includes: 1Set 3D Printers Linear Rail Guide note: Due to light and screen difference, the item color may be slightly different from the pictures. Please allow 0.5-2cm differences- due to manual measurement.