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/11.81in Suitable for: Ender-3/ Ender-3 PRO/ Ender-3 V2 Material：Metal With: Slide Plate Fixed-Seat x 2peices; Linear Guide (300mm) x 2peices ；1 Set Screws & Nuts Package Includes: 2 Peices Slide Plate Fixed Seat- 2 Peices Linear Guide (300mm) 1 Set Screws Nuts note: 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.