The BOSCH 28-7/8 in. Portable band saw blade is constructed with high-performance, industrial-grade Bi-Metal material for 3x life over standard portable band saw blades. Using advanced bonding technology, The bond between backer and cutting edge is significantly improved and strengthened. We've engineered the blades for faster cutting and reduced tooth stripping. With an optimized tooth geometry, each blade is developed for materials such as steel, iron and aluminum. BOSCH portable band saw blades are designed to fit all portable band saws requiring a 28-7/8 in. Blade.