The Twenty-clamp is a light clamp made by Doughty.
http://www.doughty-usa.com/shop/16/index.htm
It is so named since it is designed to hold a fixture weighing up to 20 kg.
There is also the Fifty-clamp which can hold a fixture weighing up to 50 kg.
http://www.doughty-usa.com/shop/16/index.htm
It is so named since it is designed to hold a fixture weighing up to 20 kg.
There is also the Fifty-clamp which can hold a fixture weighing up to 50 kg.