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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: 1200mm For 20mm slotted bearings Suits X, Y, Z axis Weight: 11lbs Package dimensions: 49"X5"X3" Package 2 X SBR20-1200mm 20 MM fully supported linear rail 4 X SBR20UU motion router solider block