This is a mount setup for a nice cheap LED work light. If you have an IKEA around, you can buy these lamps for $9.99. A little more online since IKEA does not sell them direct online. They have great output for the size/price and the goosneck allows you to snake it around and point it at what you want to see. I will be mounting mine elsewhere, but I wanted to bolted it on real quick for pictures here. This is designed for 20mm spacing and the bracket should mount inline or across the extrusions. Uses two M5 X 12mm .08 pitch socket head screws & two T-nuts Lamp mounts to the bracket with it's stock screws and washer. I printed it in ABS: .2 layer height .40 Fill