I had a pair of the Wunderlict ones too, which I subsequently sold (nothing wrong with them, they were excellent in every way). I bought them after buying a Chinese set, never again will I buy anything with potential safety implications other than pukka branded stuff. The knock offs were very poorly made, came without any instructions and one of the threads sheared on one of the risers as I installed them as the supplied bolt wasn't long enough. Buy cheap, buy twice