I ordered these linear rods for the 3D printers I've been designing/building and they work wonderfully! No problems at all. These were honestly the most economical choice for the rods, other places want upwards of around $60 for the same type of product. Mind you, you do get what you pay for but I my case, tolerances weren't as important and I didn't need chrome plated rod. All in all, I'm very satisfied and will definitely order again