This is a Foba ROBAO Long Pantograph (Scissors) with a Friction Spring. It's load hover capacity is adjustable from 2.2 - 26.5 lbs (1 - 12kg). If heavier loads are planned, add the ROSAO or ROSAE Counterbalance Spring.
This Pantograph extends from 14.5" - 12.5' (37 - 380cm).
Pantographs allow you to regulate lamp height easily
The friction clamp sets your chosen position