Strengthen your miter joints with Woodpeckers Spline Jig. A normal mitered corner lacks the long-grain to long-grain contact needed for a strong joint. Since it isn’t completely end-grain to end-grain, it will usually hold together for a while, but it’s weak and probably won’t survive seasonal changes. You can make the joint rock solid and add a design element at the same time by adding splines across the miters. Woodpeckers Spline Jig makes it simple to add splines to all kinds of mitered joint