Create columns for indoors and out using concrete or plaster with our reusable History Stones column molds. Two sizes to choose from! Commcercial Quality Yet Economically Priced 18" x 18" base & crown with 12" center section -- create as tall as you need. Molds for concrete or plaster. (please click here for more details and ordering) Multi Use Decorate Column Molds (at least 25 uses per mold) 12" x 12" base and crown molds and 6" diamter. Create or more center segments according to the height you need.