Perfect for your DIY , mills, lathes No more unwanted errors inyour machining work Aluminum rail withpre-drilled holes for ease of mounting Description: Material: Carbon Steel Size: 400x8mm Package Include: 2 X 400mm Chrome Plated Shafts 4 X SCS8UU Linear Bearing Aluminum Blocks 4 X SK8 Fixed Bearings Note: 1.Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual of the item. Thank you! a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a