Pentagon (Pack of 2) SS Smooth Rod 12mm OD 500mm Long for 3D Printer CNC Robotics DIY Projects

The media could not be loaded.  I purchased total 6 pieces of 12mm rod and when i started working with it, all bearings were loosely fited in it. Then i ordered one piece of 12mm rod from another website to check wether problem is bearing or rod. And new purchased rod fited perfectly. I measured this with vernier and it shows 11.6mm(correction in video review as 0.4mm not 0.02mm). Now i need to purchased all rods again from another website. Return period is already over so i am stucked now.