This is the Lowel Complete DP Barndoor. It's a metal frame with two rectangular and two triangular leaves, all expandable. Rotates 360 degrees and holds two accessories (dichroic, snoot, etc.)
Barndoors narrow the beam spread of a light fixture. They help create a 3-dimensional look to a lighting scheme by placing light in a specific area or by keeping it away.
Each barndoor leaf has a sub-leaf that extends, which adds to its light-shaping ability.
This is brand new in original packaging without the box. Also has a general Lowel Manual. Retails at $60