Sanding blocks are tools used in woodworking and finishing to smooth surfaces. They are typically made of a solid material, like wood or plastic, and are designed to hold sandpaper securely. By using a sanding block, users can achieve a more even and controlled sanding process compared to using sandpaper alone. These blocks come in various shapes and sizes, allowing for different sanding applications. Some are flat for large surfaces, while others may be contoured to fit into corners or curves. Sanding blocks are essential for preparing surfaces for painting or staining, ensuring a professional finish on projects involving woodworking or crafting.