These clamps were manufactured by my engineer father. He has made and sold a few products like this, these were left over and have been sitting in the corner of his shed for 10 years. He has been unable to go into his shed due to ill health, so he is selling them. They are an upright clamping system that can clamp end to end and also with down pressure they have multiple uses. I have 3 of them to sell for $250 each.new never used