Building realistic N Scale bridges is easy with the Cornerstone Bridge Pier kit, with parts to build your choice of two Single- or Double-Track Piers featuring: Common prototype design used with various types of bridges Fits steam-, diesel- and modern-eras Simulates poured concrete construction Build with or without cutwater ends for extra realism Molded cut lines for easy height adjustment to 2-11/16, 2-3/16 or 1-3/4′ 6.8, 5.5 or 4.4cm Molded in gray plastic Use with Cornerstone Single-Track Arched Pratt Truss Bridge (933-3870), Double-Track Truss Bridge (933-3242), Through Plate-Girder Bridge (933-3820), and Abutments (933-3881) each sold separately - adaptable to most model bridges Standard Assembly measures: Single-Track: 2-3/16′ L x 5/8′ W x 3-3/16′ T 5.5 x 1.5 x 8cm Double-Track: 3-3/16′ L x 5/8′ W x 3-3/16′ T 8 x 1.5 x 8cm Length With Optional Cutwater Single-Track: 2-3/4′ 6.9cm Double-Track: 3-3/4′ 9.5cm