The bit works well on its own but it's disappointing that it isn't designed to work with the crossbar and rails -Kits works as I expect the bit to. together. If the cutter is set to cut a 1/8 ledge on a raised slab, and a set of posts and railings fit on the same 1/8 ledge, then the edge of the raised slab will stick out about 1/32 inch . IMG-8986. jpgIMG-8987.JPG