If like me you are on a budget and tend to go for cheaper parts, here's a classic by cheap by twice I found.
I bought these risers in 2011 and never got round to fitting them.
Anyway today I tried and at the point of torquing them up the threads stripped out on the the bottom 2 holes. They were not even close to the recommended torque, so this shows you how utterly crap they are.
This is also a major safety issue and I just would not trust anything from this seller now unfortunatley as he is contuniung to sell these risers.
They arrived without any real packaging, just a plastic bag and in a plain white box.
There were no instructions or anything else and the post part is oval not round. The threads were tapped directly into the pot alloy.