Features:Dual linear rails,more stable than single rail version and wheel movement system.Use as many original plate and parts- as possible.Quick installation and upgrade; No lose in Z-axis height.These adapters require rails for the ender-3/pro and ender-3 v2, the length required is 300mm.For the Ender-3 V2 option, you need to print an additional Y-axis limit block to complete the assembly.Please do contact us to get the document or leave us the email when placing order.Specifications:Length approx 300mm/11.81inSuitable for: Ender-3/ Ender-3 PRO/ Ender-3 V2Material:MetalWith: Slide Plate Fixed-Seat x 2peices; Linear Guide (300mm) x 2peices ;1 Set Screws & NutsNote:Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand.Please allow 0-1cm error due to the manual measurment.Package includes:2 Peices Slide Plate Fixed Seat-2 Peices Linear Guide (300mm)1 Set Screws Nuts