Bis-Tris precast gels (4-20%, 15 wells, 1.5mm, glass) are widely used in protein electrophoresis for separating proteins based on their molecular weight. These gels are particularly effective for resolving complex protein mixtures, offering high resolution and sharp bands. They are commonly employed in applications such as Western blotting, where precise separation of proteins is critical for accurate detection and analysis. The 4-20% gradient allows for the separation of a broad range of protein sizes, making it versatile for various biological samples. The glass-backed format ensures durability and ease of handling during the electrophoresis process. These gels are ideal for research in molecular biology, biochemistry, and proteomics, where detailed protein analysis is required.