Mssoomm 2PCs SCS12UU Aluminum Linear Motion Ball Bearing Box Bushing 36mm Long Linear Roller Bearing Slide Block for CNC 3D Printer Accessories

So, there are no adjustments on these bearings, but the actual fit straight out of the packing is certainly good enough for this particular application. I'm not sure I'd use these for an ultra high precision application due to the lack of adjustability but I can't honestly say anything negative about these, as the price was so low, I'm actually surprised they're of decent quality.The mounted up easily and the slide showed little resistance and to this, I'm really pleased.I would purchase these again for use in basic operations as I believe they'll last a long time and provide good service for the next few years. Perhaps drilling and tapping a zerk fitting would prove worthwhile.These are a good value and a worthwhile product to have in your shop.

As another review suggested, the support clamps are too big for the guides. I ended up using them as they are and added some wood stops just outside the supports to prevent the guides from moving. It's a cheap product and you get what you pay for. I'd suggest ordering the parts individually.

This product was perfect for my project.

Becareful with sk12 included, it’s useless. Sk12 dont have the correct dimensions, it’s necessary to buy another set to replace the sk12 included

All four of the brackets that came with the kit are drilled to big to tighten down on the rod. The are about three millimeters too big.They are useless and cannot be used with this project. Also one of the three blocks that slide up and down on the rod is bad. The dimensions are off as can be seen in the pictures.