Vertical Roller Mills. We manufacture a large number of wear parts for popular Loesche, Fuller, UBE, and Polysius roller mills. Read More. Grinding Mills. Call Columbia Steel for our full line of cement plant parts for rod, ball, and semiautogenous grinding mills. Read More. Preheater Kiln Parts. Reduce your cost per ton with our thimbles, inlet trays, nose ring segments, tail ring .