Bi-metal blades are cutting tools made from two different types of metal, typically combining high-speed steel and a flexible backing material. This design allows the blade to be both durable and flexible, making it ideal for cutting through various materials, including wood and metal. The high-speed steel edge provides sharpness and longevity, while the flexible backing helps prevent breakage during use. These blades are commonly used in tools like band saws and reciprocating saws. Their unique construction enhances performance and extends the life of the blade, making them a popular choice in both professional and DIY applications.