PERFORMANCE: Our Bi-Metal hacksaw blades with unique high-speed steel safe-flex technology offer a sturdier construction and long-lasting cutting performance. DURABLE: A patented solid-state diffusion process produces the industry’s most advanced bi-metal hacksaw blade. HEAVY DUTY: Excellent for interrupted cuts in cramped places or where the blade is subject to bending or twisting stresses. FLEXIBLE BLADE: Safe-Flex technology allows the blade to be flexible, so much so that it can be tied in a knot. Plus, if the blade does break, it won’t shatter into multiple pieces BLADES TEETH: Starrett hacksaw blades feature a massive increase in tooth strength and reduction in breakage and fracture when compared to traditional bi-metal blades 18 TPI: Starrett bi-metal shatterproof blade has 18TPI, ensures a longer working life, with hardened teeth for maximum wear resistance. WIDE APPLICATIONS: This Starrett hacksaw blade is for heavier-duty cutting jobs, such as steel rods, and pipes. wood, plastic, rubber, bamboo, rope, soft metal, PVC, furniture, etc.