The Yonico 15334 lock miter bits set is reversible. Then, cut one piece horizontally and the second one vertically and the joint should line up perfectly. Note: Lock miter bits only work properly on solid wood.
Exactly as advertised. Great product support, There's an excellent guarantee. It took me maybe an hour to get the head aligned "just right" but once it was there the results were impressive. I'm delighted I bought the set. Cheers!