All the ceramic parts on this page are good to Cone 10, but not the metal parts. Mid and high fire pots are usually not stilted. Instead, glaze is wiped off the base of the pot. There are reasons for this. For one thing, clay deforms as it approaches Vitrification, so your piece may deform around the stilt/rod. Also, metal softens at such high temperatures, and cannot take much weight. Sometimes people have mid-fire pieces they do want to stilt, such as jewelry, ornaments, etc. and they use stilts for this purpose. Just keep in mind the metal rods will begin to deform as you exceed cone 6, and even earlier if they are heavily loaded. Spread the weight over as many stilt points as possible to optimize your result.