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.
Tim D 
