Its a remix of Brio Duplo Bridge connector. Original was not bad, but had very short ledge to put on the wood track, so it might fall or wiggle to much. This extends the ledges on which the wood tracks rest, making it more stable.
Made a bunch for my nephew as a Christmas gift. I’m sure he’ll love them. One thing to note, they don’t actually have a compression fit on a Duplo Lego but they should always be right side up so shouldn’t matter.