Description:  8x200/300/400/500/600/700/800/900/1000mm Optical Linear Ball Bearing Rail Guide Support CNC Set.  The linear shaft is widely used in the automatic transmission device, such as industrial automatic machine, automatic recorder, computer, p recision printer, etc.  Colleagues due to hard, you can extend the life of the bed of ordinary p recision instruments.     Specification:  Material: 45 carbon steel(chrome plated).  Accuracy: G6 level.  Hardness: HRC58-60 degree.  Length: 200/300/400/500/600/700/800/900/1000mm (optional).  Diameter: 8mm.  Quantity:  1 X Chrome Rod Rail Shafts.  2 X SCS8UU Linear Bearing Aluminum Blocks.  2 X SK8 Fixed Bearings.     Main purpose:  linear a xis is widely used in automatic transmission, such as engraving machine,  woodworking machinery, printing machinery, industrial robots etc.     Package Included:  A Set Of Linear Ball Bearing Rail (5pcs).     Notice:  1. Please allow 1-3mm error due to manual measurement.Pls make sure you do not mind before you bid.  2. The color may have different as the difference display,pls understand.