1/4" x 3 1/2" Black Shims. Color coded for convenience. Economical to use for all your shimming and leveling needs. For use in the installation of windows, doors, storefronts and insulating glass units. High-impact plastic horseshoe shims are weather-proof and will not rot, rust, stain or leach. Color: Black, Thickness: 1/4", Length: 3 1/2", Width: 1-7/16"