A picture (and description) can say 1,000 words.
http://www.knifemart.com/kermabit.htm
I've seen these things (often "thug types" carrying them around in their hand), never had a clue what they were. I'll definitely have a quick hand on my grip the next time one comes my way.
>"It is the ideal blocking tool enabling you to stop full-power blows and even kicks; with no fear of injury to your hand."
I fail to see how it can eliminate the risk of injury to your hand?