General description IRWIN® Bi-Metal Hacksaw Blades are designed for durability and versatility. This pack contains 100 blades, each measuring 300mm (12 inches) in length with a tooth count of 24 TPI. These blades are safer than traditional HSS blades, offering flexibility and shatter resistance, making them suitable for cutting a variety of metals. Technical specifications Length: 300mm (12 inches) Teeth per inch (TPI): 24 Pack quantity: 100 blades