MGN12H 800mm Linear Rail Guide 2 Carriages MGN12 Linear Slide 8mm for 3D Printer and CNC Machine Upgrade

Product description <img alt="linear guide rail 200 300 400 500 600 700 800 900" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/dbdfa334-5aee-483e-ace0- bb02ba7c90da.__CR0,0,970,600_PT0_SX970_V1___.jpg"> <img alt="Linear guide Sliders Guide rails Guías lineales Deslizadores Rieles guía" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/be878397-1427-4f4b-8293-2605fd9251e8.__CR0,0,970,600_PT0_SX970_V1___.jpg"> <img alt="Easy installation Easy to operate" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/dc4fcd68-098a-4004-8b80-dad259756e4e.__CR0,0,970,600_PT0_SX970_V1___.jpg"> 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.<img alt="Bearing steel Accessories" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/9dd7cb95-bcc9-4e96-b4ce-5addd700a704.__CR0,0,970,600_PT0_SX970_V1___.jpg"> <img alt="Quiet High stiffness weight-bearing Dustproof" src=https://m.media-amazon.com/images/S/aplus-media-library-service-media/28e0093e-6e41-47ec-97eb-e50557547615.__CR0,0,970,600_PT0_SX970_V1___.jpg">