Building realistic N Scale bridges is easy with the Cornerstone Bridge Abutments kit, with parts to build your choice of two Single- or Double-Track Abutments featuring: Common prototype design used with various types of bridges Fits steam-, diesel- and modern-eras Simulates poured concrete construction 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 Bridge Piers (933-3880) each sold separately - adaptable to most model bridges Standard Assembly with Wing Walls measures: Single-Track: 7-3/8′ L x 5/8′ W 18.7 x 1.5cm Double-Track: 8-9/16′ L x 5/8′ W 21.7cm Height with Headwalls: Short Headwall: 3-1/2′ 8.2cm Large Headwall: 3-3/4′ 9.5cm Wing Walls (each): 3-1/8 x 1/8 x 3-3/8′ 7.9 x 0.3 x 8.5cm