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Introduction The material is the high quality steel, extend the service life of the shaft and the machine. The shaft is case hardened, If you use normal steel shaft,The bearings will be reduce in use process.Besides, it's more durable than Plastic linear bearing. Move smoothly without deflection, minimal wear and low noise. Feartures Steel material and hardened Case Pre-drilled holes on the support rail mounts High accuracy and strong durability Accept customized length and assembly Parameter Rail width: 5mm Rail length: 1500mm Material: Gcr15 steel Weight: 14lbs Package dimensions: 60"X5"X3" Package: 2pcs 15-1500mm linear guideway length 300mm 4pcs square type carriage bearing block internal width 34mm