2Pcs 1000mm /39.4 inch Linear Rail with 4Pcs SBR16UU Linear Bearing Sliding Block CNC Parts for Fully suppoeted Shaft Rod

High quality, I used to build by saw fence, worked great Wish it came with 2 handles vs 1, but would still recommend!

Product seems to be of a high to mid grade quality. The ball bearings run smooth right out of the box. Rails were straight and looks to provide a rigid platform. Great for hobbyist wood worker/ craftman. I received my shipment with only 2 of the 4 Bearing Blocks: SBR16UU. Contacted seller and they sent me the missing parts 5/5 would recommend.

I'd give these rails and blocks a full 5 stars but upon closer inspection it looks like they've been used before & I didn't buy used. I paid for new. Not sure if that's Amazon's fault or Guwanji.They appear to be straight, the blocks seem to be in good shape it just appears they've been used before.I still highly recommend them. Just inspect them upon arrival and make sure they are straight if they appear to be used.

The parts I received had some quality issues but the seller was quick to address them.

Did the job with room to spare.

I like

I actually bought two of these. They rails are very smooth and well constructed. The sliding blocks on the first set were very smooth and worked well. Unfortunately, 2 of the 4 sliding blocks on the second set were very rough. I continued to run them up and down the solid piece to see if maybe the ball bearings just needed to loosen up, but it didn't help. Due to their size, I decided to keep it and just hope it smooths out over time. I would recommend checking the smoothness of the slide before getting rid of the packaging.

The media could not be loaded. Poor quality control out of the 16 possible threaded holes six of them did not completely chew the threads up on the provided screws and 2 holes were completly off by .05 which might not seem like much until you realize that's how it mounts to whatever so it's going to be pulling to that side so bearing carrier housings are completely useless with the set I got.I'm currently trying to get a hold of the company or seller to see if they will send me new bearing carrier since these are junk but having trouble even getting a hold of them.