Larger 3" x 4" (76 x 102 mm) Size Color Coded for Convenience Available in Three Thicknesses CRL Jumbo Size Plastic Horseshoe Shims are preferred for use in curtainwall construction and other installations requiring the leveling of larger members. These high-impact styrene shims are molded to a jumbo 3" x 4" (76 x 102 mm) size in standard thicknesses of 1/16", 1/8", and 1/4" (1.6, 3.2, and 6 mm). Precisely sized and balanced for vertical and horizontal installation. Color: Black Thickness: 1/4 in. (6 mm) Length: 4 in. (102 mm) Width: 3 in. (76 mm) Minimum Order: 1 Package (50 Pieces)