MGN12H 400mm Linear Rail Guide 2 Carriages MGN12 Linear Slide 8mm for 3D Printer and CNC Machine Upgrade

Product description Product description Linear guide rail 200 300 400 500 600 700 800 900 Easy installation Easy to operate Installation screw size M3×8mm The guide rail may have a tolerance of ±1mm but this does not affect normal use The mark on the bearing surface is only the mark made by the factory not a scratch Normally each side is lack of 1 or 2 balls The carriage block will get stuck easily if it is full of balls the balls on each side need some room Some lubricant is needed the longer they are used the smoother they will run Quiet High stiffness weight-bearing Dustproof