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.
Have ordered several of these. Most of them are great for what they are. Have had to retap a couple of the bolt holes, but for the cost they are great. Wish the mounting holes were in more consistent locations. Fine for wood mounting, but if planning on an aluminum frame it makes planning difficult.
Tim D 
