1.Carbon Steel Materials: Metal files are made of carbon steel which has high hardness. The fine-grained texture of the rasp is deeply tempered and coated for long-lasting cutting performance.^ 2.Comfortable Handle: The ergonomic handles of the small wooden files provide a comfortable feeling when using. A soft handle firmly attached to the file blade and fits comfortably in the hand, the operation is time-saving, safe and reliable.^ 3.Portable and Durable: The micro metal files set has a transparent grain surface, which is durable and reusable. This needle file set is in a compact and sturdy plastic carrying bag, easy to carry and store without taking up much space.^ 4.WIDE APPLICATION: This rasp is ideal for shaping wood, metal, jewelry, diamond, mirror, glass, tile, ceramic, leather and plastic that require precision work on small surfaces and narrow areas. The hand file is very suitable for carpenters, engineers and someone who takes DIY or model making as a hobby.