16mm Linear Rail Guide 2Pcs SBR16-400mm Linear Rail Guide with 4Pcs SBR16UU Bearing Block for Fully Supported Linear Rail Length 15.7 inch(400mm)

Product looks good. Was packed well. Have to see how the bearings perform.

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

The media could not be loaded. Worked extremely well to make a router sled for flattening slabs. One rail was damaged in shipping and the seller made it right immediately. Good customer service

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.

My seller, GUWANJI, replaced my shipping damage quickly and graciously. Thank you.Their product is fine.

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

Bought the 2000mm and its not even remotely straight, can't be used for anything requiring precision

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.