Door Pediment Inserts: Made of virtually indestructible high-density urethane our door pediment inserts are cast from steel molds guaranteeing the highest quality on the market. High-precision steel molds provide a higher quality pattern consistency, design clarity & overall strength & durability. Lightweight they are easily installed with no special skills. Unlike plaster or wood urethane is resistant to cracking, warping or peeling. Factory-primed our door pediment inserts are ready for finishing. Fits door pediment 18870. Fits pediment 18870. Measures 4-1/2 in. H x 17 in. W.