Review on Iverntech MGN12H Linear Rail Guide With Stainless Steel Carriage Blocks - 700Mm Length For 3D Printer And CNC Machine by Justin Ott

Can’t compare to anything since these are the first linear rails I’ve used. They came packaged well and straight. Not major dings, but the carriage blocks were not identical between the four rails I got. They were all the same size and bolt pattern, but the internals were all a bit different.Don’t have an accurate enough caliper to verify the ball size, but my caliper measure 2.38 for the balls. Take that for what you will.After a good cleaning and some super lube synthetic grease these are working quite well on my ender 3 pro. Time will tell how reliable they are.