The Dnail is designed and produced by Pukinbeagle Glass. The Dnail is an efficient design for use with a barrel style heating coil. The coil wraps around the 16mm or 20mm base of the Dnail, thus heating the inner walls of the Dnail. A spout is placed perfectly in the center to give some height and space to the surrounding dish. Now Dnails come with an option for a 20mm Disorderly Conduction coil that will fit.