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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 Length: 1000mm For 12mm slotted bearings Suits X, Y, Z axis Weight: 11lbs Package dimensions: 44"X4"X4" Package 2 X SBR12-1000mm 12 MM fully supported linear rail 4 X SBR12UU motion router solider block