Hi
I did order a kit from banggood.
It was the rod Type of linear rail.
The Chinese do not understand how to package precision parts my was just wrapped in thin plastic just like a plastic bag. They was bent so much I could see it with the naked eye.
Another thing to consider is quality control.
China is not known to bee good at it. My rails was supposed to be hardened. One of em was not.
Several was really soft hardened in one end but was hard as tungsten in the other end.
It as 600mm rod (24in).
Get my frustration when I did find 10 times the quality for like half or quarter of the price home in Sweden.
From now on I gladly pay more (if it even is more expensive) to get it right and skip the hassle the first time. So I only buy from Sweden and Germany. Oh did I mention that they did send me a pirate copy of an jkm Nema 17 that has half the torque.