CNC Parts 2Pcs SBR20-1200mm Linear Rail Guide with 4Pcs SBR20UU Bearing Block for Fully Supported Linear Rail Length 47.2 inch(1200mm)

I bought two sets of these to make a manual CNC of sorts, for my router. No complaints with the rails or the function of the bearings, however, the holes are not laid out on the bearings the same from bearing to bearing or from center to center, this forces you to make a template for each and make sure it is aligned before you can attach them. I would probably rebuy, but you need to know this prior to purchasing, they are not plug and play.

Rails had some light damage from shipping that will cause bearing failure down the road, a few of the bearings run rough. Quality for price is 10/10

Bought 2 sets of these rails and 4 of the 8 bearings were no good. They did not slide smoothly at all on the rails and had to be returned.

Rails themselves are good, but the bearing blocks are not very good quality. 2 of them were good, but the other 2 were not great. One of them was damaged and felt like sandpaper going down the rail. The other did not slide very smoothly and it had no visible damage on it.

Used these rails as a base for a router sled. Worked very well for wood slabs.

The media could not be loaded.  Rails are fine but the bearings are all of varying quality and one of of four was completely inoperable. Instead of returning the entire set of rails and bearings I'm just going to buy replacement sbr20 bearings from some other source.

I have both rails but I am missing two blocks, what I can do?

Had a minor problem with shipping. The package was damaged and 2 blocks were missing. They responded immediately and sent out replacements. Great customer service. Product is exactly as advertised.