N/C 2PCS Linear Rail SBR16 500mm with 2 Linear Guide Rails and 4 SBR16UU Bearing Blocks for DIY CNC

High Quality Fast shipping!

What are the specs for the threaded holes on top ? M5?

The rail and rail support is fine. What is horrible are the bearings. Very gritty feel when sliding. Not smooth at all and you can feel bearing lockup randomly while sliding. The fitment of the bearing block on the rails is loose (wiggles). You can tighten them with a single allen screw on the top to increase resistance, which will reduce some of the looseness but then the bearing rolls even worse on the rail. Bad idea for any CNC rail support setup. An option would be to anticipate buying high quality bearing blocks for the rails.

Works great love it best value for my money

The dimensions pictured in the amazon listing start at SBR16.

Bought these for a custom built 3d printer with a heavy bed and wanted supported rails. Rails are ok-ish (useable) but the bearings are horrible. They grind and stick and even after thoroughly cleaning and re-lubing with high end lubricant, these still roll like stones and make this setup completely un-useable. Returning these and going a different route. Cost me 4 days (2 waiting for these to arrive, and 2 more to find another solution) in my build.

Producto muy bueno descripción exacta llego mucho antes de tiempo bien empacado muchas gracias

Awesome! Great Buy.... Very happy