The tenon is shaped so that it fits into a matching rectangular cavity called a mortise.
Tenon cutters attach to the end of an electric drill and shape the ends of the logs so they fit into the holes, or mortises, of another log piece, creating a mortise and tenon joint.
Rustic Furniture Workshop by Dan Mack includes an easy to understand explanation, including pictures of the technique of making mortise and tenon joinery.
Tenons are the shaped ends of wooden pieces that fit into specially crafted holes to form mortise and tenon joints.
In diameter, and had a double row of piles, bound by horizontal stretchers with square mortise-holes, enclosing an area 60 ft.