Description: 8x300/400/600mm 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 precision instruments.    Specification: Material:45 carbon steel(chrome plated);  Accuracy:G6 level;  Hardness:HRC58-60 degree;  Length:300/400/600mm (optional);  Diameter:8mm;  Quantity:1 set (5pcs).    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.    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