Files are made of steel sections, cut and shaped precisely to meet the requirements for the working material. After preheating and softening the steel, teeth are struck out by a chisel. Files differ by the type of steel, the form of the grinding part, the depth and smoothness/roughness of the cuts (teeth). A file is a valuable addition to any tool set, and though it's not used as often as it was before industrialization, this instrument is still employed in metalworking, woodworking, and similar industries. Shop with Mega Depot and find high-quality yet affordable products!