Experience robust, adjustable support with our BFSEALS Plastic Structural Shim Horseshoes. These U-shaped, 3" x 4" x 1/16" shims, available in a pack of 120, offer exceptional compressive strength for heavy-duty applications. Crafted from high-quality, American-made plastic, they provide reliable support for windows, doors, and architectural installations. Each shim is heat-sealed into 1" stacks of 16, ensuring easy separation and time-saving installation. The intuitive easy snap design allows for swift adjustments, while the color-coded options (including blue) cater to various preferences. Customize leveling precisely with adjustable thickness and length options, ensuring a perfect fit for your project.