This is a bridge post for Kato Unitrack N. The top of the post is designed to fit inside the bottom of the N-gauge Kato Unitrack bedded track. They will not "click" in, but are relatively stable even in a "flying" layout, and in a fixed layout, a drop of hot melt or mounting glue will do its job. I provide heights from 40mm (gives enough clearance for an N-scale diesel loco to pass just under it) to just a couple of mm. Change them and adapt them to your needs all you want.