T12 carbon steel blades with 1.15–1.24% carbon content provide greater hardness and wear resistance than standard files, helping you achieve cleaner edges and longer tool life. 17Piece Metal File Set includes: 4 large files: flat / square file, round / rattail file, halfround file, triangle file 12 small mini needle files 1 multifunctional brush for cleaning filings and maintaining filing bits Key attributes and benefits: Material and durability: T12 carbon steel blades offer improved edge retention and durability for longer life in routine filing tasks. Versatility: Suitable for filing a variety of materials including metal, wood, plastic, glass, ceramics, and leather. Comprehensive set: A combination of large and mini files covers both broad shaping and precise work, with a brush included for maintenance. Reach and compatibility: Shaped to access flat surfaces, curves, radii, and tight corners, enabling a wide range of work—from coarse stock removal to fine detailing. Use scenarios: Metal fabrication and repairs: Deburring, shaping, and refining edges on metal parts, brackets, or fasteners. Woodworking and plastics: Smoothing joints, shaping profiles, and removing excess material from wooden or plastic components. Craft and detail work: Precision work in jewelry making, model building, leather edging, or fine glass and ceramic edge finishing, with the mini files reaching small features and tight corners; the brush aids in cleaning debris from grooves and file teeth. Includes 4 large files (flat/square, round/rattail, halfround, triangle), 12 mini needle files, and 1 multifunctional brush for cleaning and maintenance.