This is a simple support structure for the LILLABO train bridge, the green one seen here:http://www.ikea.com/us/en/catalog/products/40292704/This bridge is a different height than the support pieces found in the LILLABO basic set, which is silly. Anyway, the bridge comes with two supports that are always knocked over by my son, so I designed this with a screw hole so it can be held fast to the bridge so it won't topple over so easily.This support is also the same height as the Melissa and Doug Swivel Bridge seen here:http://www.melissaanddoug.com/swivel-bridge-train-setIncluded is the sketchup file for this thing.