2 PCS 8mm x 500mm (0.315 x 19.69 inches) Vigorous Linear Motion Rods, Case Hardened Chrome Shaft Linear Rail Rod Shaft for 3D Printer, DIY, CNC - Metric h8 Tolerance

This shaft is incredibly good value when compared with other linear guide shafts available from industrial supply houses like McMaster. The diameter is within the h8 tolerance, just as stated. The shaft is case-hardened and can be cut with carbide parting tools. The shaft center is soft and can be drilled and tapped with conventional HSS tools.

Super sturdy. Can easily support my full body weight without permanently deforming. I have this rotating in a set of two bearings about 2.5 feet apart, and it's critical that the axel stay very straight, and this rod has done awesome.Hard enough that the set screws don't chowder the surface when they are locked in place, but not so hard that the set screws just slide over the surface.

Showed up packaged well, straight, and good tolerance/accuracy. Bearings/gears/pulleys slipped right on. Do need a cutoff wheel to cut to length, my portaband cried.

True to dimensions and do the job.

Exactly as described. Quality steel!

This bar is the right diameter to bend a cetme flat around and buying it though amazon was the cheapest option. It didn't flex in the press, just worked out great.

Used for holding 5 rolls of filament on a prusa enclosure. No issues for quality and looks fine.

Good price for metal rods. Used to make a rock tumbler.