48 inches, straight, no binding. Bearing blocks have smooth motion. Glad i bought 3 sets. No trouble with any of them. 4 stars because i have never rated anything 5 out of 5. These are beefy and worth the price to me.

the product quality is as I expected. The linear bearing are much better than the standard ones in term of quality. The seller speeded up my purchase and I got it on time. I recommend this item.

Very Pleased with my Order... Well packaged. All bearing blocks needed a very little adjustment and works great.

Looks good in process of building cnc.on time. Good product.CI.

Very strongGood quality

Exactly what I needed for a great price

Exactly what I expected. Ball bearings are low quality, but was to be expected.

We needed a linear rail guide to test a steel wire cable system modification. This has helped us a lot with our planning.

I got these to mount a router for slab milling. There is no play in the bearings, and they are very sturdy. lightening fast shipping.

Works well to level live edge slabs