Set of three teapot cast iron trivets, as is

Three vintage trivet, set of two with clay inserts, one is complete with the item that says made in Taiwan SAN space HO, trademark the other one is the same item but it is missing the porcelain inset, the third item is just a solid trivet that has enamel inset, some of the enamel has been broken, it is marked But the marking is unreadable there is a stamped number five on it as well Black shelf