The mortise and tenon is used to create Mission, Craftsman, and Prairie style frames. Although there are many types of mortise and tenon joints the two most commonly used to construct frames is the hidden tenon and the through tenon. To secure each frames corner either a round peg or square peg is used. To give a frame some flair and/or uniqueness there are a few options offered on how you can have the pegs appear on your frame. Options such as, pillowed pegs, dual pegs, diagonal, select a different type of wood such as ebony for the pegs. Depending on what you're framing each frame can be built specifically to match your needs such as the orientation of the frame. Pictured is just a couple samples of many types and shapes of mortise and tenon frames. Please visit my site to see more offerings.