This jig is designed and build by William Ng for making his protruding Ebony Spline as seen in some of his work. The jig is completely assembled and ready for use on table tops with 3/4" thickness. The jig will be signed and dated by William himself. You can see the jig in action on You-Tube http://www.youtube.com/watch?v=WqRwrhm6lVU