We had a lot of fun with this project. It was a prototype for this method of installing floating shelves using 5 1/2″ long 1/2″ wide x 1″ steel bolts. the mortices are made using a Festool Domino Joiner. We decided on using a “live” or “free” edge where the original profile from the tree trunk is left nearly in its natural state. The walnut we selected was finished using an oil based polyurethane to stand up to being washable in a kitchen environment.