Blue 1/16'' x 3-1/2'' Horseshoe Shims - Package of 1000

Simplifies all leveling requirements. Color coded for convenience. Easy to install. Three standard thicknesses to make it easy to mix or match. For use in the installation of windows, doors, curtain walls, storefronts and insulated glass units. The 3-1/2" length is popular to install storefront aluminum, as most major storefront fabricators use 4" tubing.