1. material: The rasp files are made of quality carbon steel with exceptional strength, ensuring sturdiness and hardness. The finegrained texture is deeply quenched, guaranteeing durability and longlasting performance. 2. ERGONOMIC DESIGN: The overmolded rubber handles feature an ergonomic design for a firm grip and control, even in humid conditions. The dipped handles provide a secure hold, enhancing efficiency and speeding up your work. 3. EASY TO USE: The precision metal file has a clearly defined surface grit, with sharp gear teeth that improve cutting efficiency. Avoid using the steel needle file as a crowbar, as it may break easily. 4. WIDE APPLICATIONS: This needle file hand tool set is ideal for removing, refining, reshaping, and scraping tasks. It's for detailed work on wood, metal, jewelry, mirrors, glass, tiles, ceramics, leather, and plastic, especially in small or tight spaces.