ANWOK 2Pcs Linear Guide Rail HGR20-800mm with 4Pcs HGH20CA Square Type Carriage Bearing Block Linear Rail Set Slide Guide Rod Overall Length 31.5 inch(800mm) for DIY CNC Routers Lathes Mills

okay, I'm not using these as they were intended, rather I built a keyboard tray for my wife. these are SO smooth compared to the normal crap trays out there. nice to use, my wife is please as can be. That said... they are nice linear bearings, cost is easy to deal with, and they seem to hold on to a 5-ply shelf upside-down without issue. I think you can mount them in any direction you like.

Quality

Excelente muy buenos

i used the rails for a CNC machine. perfect for my application

Don't picture mounting hardware & tools if it doesn't come with it. There is also no instructions or a spec sheet included so you can go get all the correct hardware. Also if you remove the blocks from the rails (and you will) put the little plastic parts at the END of the RAIL when you slide it off to maintain the roller balls, otherwise you WILL have some fall out. Had to learn that the hard way. Wish I had bought the round rails from VEVOR instead.

These things are bigger than I anticipated, but in a good way. They have really nice rigidity and yet still took smoothly for any sort of motion application. I’m personally installing them on a mini cnc plasma table

The HGR guide rail kit arrived early, it was carefully and securely packed, and the parts were fine. I dinged this otherwise terrific product a star because it contained 16 M5x.8x16mm mounting screws, and there are 18 mounting holes. I made a trip to the local hardware store and bought the needed screws. That's what I didn't like about the sale. What I did like was the following: 1. The guide rails themselves are carefully ground to final size, they're lubricated, and the edges are smooth; no cut fingers in working with this product. 2. The carriage blocks are smooth, clean, lubricated, and their bearings support the blocks as they glide, and I mean glide, quietly along the guide rails. It's all very smooth. No side-to-side wobble. 3. The dimensions, mounting holes, and counterbores are all very close in size. I miked the mounting width of the two pieces of 500 mm guide rails at several steps, and all points were within .002 mm. I set a caliper at the outside edges of a pair of mounting holes, locked the transit, and then moved the caliper to the other hole pairs. Snug fit everywhere. Just right. 4. The cost for 2 pieces of complex shaped steel guide rails 500 mm long and four carriage blocks, delivered to me, ahead of schedule, was $50.02, plus local tax. It's a bargain. 5. One more item: The carriage blocks all have serial/build date numbers within a few dozens of each other. They're identical in appearance. Tip: Have a small magnet available when you mount the guide rails. The screw heads and counterbores are a snug fit, and removing the screws without a magnet is not easy.

Worked Great

Bought 4 of these rails which comes with 8 bearing blocks, however 7 of the 8 were the same except 1. The threads were also tight on that one.

I was hesitant purchasing as wondering about the quality. Once installed on my drum sander, heavy motor one side and heavy drum on the other the motion was seemless and super smooth and the most important ,zero play. No twist,no side to side movement at all checking with multiple dial indicators. My only negative point would be you have to be extremely careful removing the truck from the rail and also installing the truck on the rail as the ball bearings are very easily popped out but once installed they are great. Just use the plastic pieces that come with them and its perfect.

Look better in hand than advertisement photo and heavy for such a small package wish the supplier had more sizes like 20mm rail 1500mm long in sets of 2 or 3 pairs for better pricing. Better prices make more sence for home biulders like me. Good deal if they stay tight and only time and use will tell that. Thanks