CNC Parts 20mm Linear Rail, 2Pcs SBR20-500mm(19.7 inch) with 4Pcs SBR20UU Square Type Block Bearing for 3D Printer and CNC Machine

I needed some rails for a project I am building and decided to try these. The quality was great, I found them to be of very nice quality, smooth operation and built well. The Stainless rails were very, very hard and should resist wear well. I am very pleased and would purchase these again, and will should the need arise.

Great quality

Very good quality rails,nicely made. Bearing pieces glide perfectly. I am mounting a compound miter saw, using metal plate bolted on with included metric bolts. I welded threaded rod to metal plates to bolt the saw. I mounted the railed on 2” square tube. The saw slides flawlessly on the 3’11” rails

Using it for a sliding base on my flight sim chair. Only dropped a star for two reasons: one bearing drags badly and there's no grease on said bearings. Otherwise it's fine. I am around 200 lbs plus an additional 100 ish lbs for the seat and other stuff. Slides fine except the one that's dragging but otherwise works fine.

When I received these rails, I was very impressed with the quality material used for these pieces! These are perfectly machined and not made with flimsy, substandard materials. You just don't see this type of quality much anymore. They easily handled the load that I used them for (but rated much higher) - with very smooth gliding action. I can't say enough about the quality of these pieces - and at an affordable price! Would highly recommend these rails for most any application where quality is critical.

Worked perfectly. Easy sliding. Well made.

Exactly what I needed for router sled. I had an issue with 2 of the bearings, wrote to customer service and had replacements in less than a week! Linear rails are heavy duty and router is riding smoothly. Full size Makita very heavy! Totally happy I finally ordered these!

I bought these and some other rails to flatten some slabs from a tree I cut up. No complaints here. I bought a Bora Centipede table and screwed them down to 1/2" plywood. Unfortunately, the plywood bowed. I recently purchased the Bora t-track tabletop mdf panel and I am currently trying to figure out a way to install this in the t-track. I want to mount the rails in such a manner that I don't have to screw into the wood and I can add spacers underneath to elevate the rail.