20mm Diameter 30"inch Long Hardened Rod Linear Motion Shaft

Best used for moving things less than about 40 lbs. With my untrained eye, there seemed to be about .020 " of distortion along the rail with the load that I used. Please note however that I have yet to complete my machine. Besides the physics which would not likely change with the supplier, the rods seem to be well machined, and if they are plated, there is no mars in the plating. Very good and accurate for the price.

It is a steel rod

Building a CNC machine works great for my Y-Axis of my machine.