If you're interested in completely covering ceramic pieces with glaze even on the bottom surface but want to make sure your work doesn't spoil your oven racks, you might want to try the conical base (cone 10). The sturdy base is specifically designed to allow you to burn your ceramic pieces in your oven with the glaze on the underside. The base has three points of high-quality alloy steel that are evenly spaced and embedded in a stone base. It leaves no trace on the burnt glazes and can be easily removed after burning. The glazed pan is simply placed over the metal dots on the top side of the base in the oven. The base raises the pan so that it is not in contact with the oven rack, and the metal dots on the base will not stick to the glazed pan, even though they are in contact with the glass. Now you can finally enjoy full cut glazing! Our F Series base is designed to fit lids, deep tools, or anything glass with a dent. This long lasting base is designed to withstand frequent burns and harsh handling. It is strong and durable, because it is made of a high-temperature clay body that can burn up to 2400 degrees Fahrenheit (cone 10), and it is made of the highest quality materials. The points are made of the finest metal alloys, making them durable and long lasting. The height of the base #9H of the F series is 2 inches and the point-to-point spacing is 2 inches.