These are tilt-out double pane single hung aluminum frame windows designed to fit in concrete block construction. The metal portion of the balancer is 28" long and the spring inside it is about 18" long. I will buy at least a dozen of these if you have them. I need the whole assembly including the piece at bottom that the window fits into.
I also need a couple of replacement lock assemblies that sit on top of the bottom sash.
These windows were made in 2001, the company is out of business. I can't remember the entire brand name but pretty sure "2000" was part of the name, like Light**** 2000 or something similar.
Thanks,
David