This is how box treads are made. Kavan, The Prince Of Treads, is seen here gluing up walnut 3” box treads. Wonder why a stair with box treads is expensive? A ton of labor goes into each one of these beauties. These still need to be chopped, sanded and then the ends will be veneered. More or less, these are continuous waterfall treads on all 4 sides. Enjoy!