Looking for tough tools? IRWIN offers a vast selection of durable tools and devices to make work at the job site easy. IRWINs innovative WeldTec tooth geometry provides faster, smoother, less tiring cutting. WeldTech also offers greater resistance against tooth strip page to increase blade longevity. Bi-Metal construction prevents these blades from shattering for a longer life. The M2 high-speed steel cutting edge delivers increased heat resistance versus other edge materials. This three-pack contains one 12-inch (300-millimeter) Bi-Metal hacksaw blade in each of the following configurations: 18 TPI, 24 TPI, and 32 TPI.