Final answer:
Hand hacksaw blades come in two categories: high-speed steel (HSS) for cutting tough materials and carbon steel for flexibility and general-purpose cutting.
Step-by-step explanation:
Hand hacksaw blades fall into two basic categories, which are defined by the way the teeth are set and the durability and flexibility of the blade. These categories are high-speed steel (HSS) blades and carbon steel blades. High-speed steel blades have teeth that are more durable and are suitable for cutting tough materials like metal and hard plastics. Carbon steel blades are more flexible and are typically used for general-purpose cutting tasks. Both types of blades come in various lengths, widths, and tooth configurations, which are chosen based on the material to be cut and the desired finish of the cut.