The Tandem Cap or Two Opening Newel Cap for the 6010 profile handrail is used to join two in-line rails over an intermediate Dowel-Top Newel Post in a continuous or over-the-post railing system. As with all of our handrail fittings they are precision manufactured to match our straight and bending handrail profiles. However, because wood expands and contracts at differing rates due to temperature and humidity, expect some sanding to insure a perfect joint.