Sandflex® bi-metal hacksaw blade, the virtually unbreakable and splinter-free blade for all kinds of metal cutting. With a tough spring steel in the back and a hard, durable high-speed steel in the teeth, the blade retains its sharpness and durability for a very long time. Sandflex® combines very high cutting properties with a high degree of flexibility that is significantly better than any other high-speed steel blade or other conventional flexible blade.