Alloy Steel Blades are made from T12 carbon steel containing 1.15–1.24% carbon, delivering higher hardness and wear resistance than standard files. This material provides longer life and reliable performance for demanding filing tasks. 17 Pieces Metal File Set Includes 4 large files: flat/square file, round/rat tail file, halfround file, triangle file. Includes 12 small mini needle files for detailed shaping and finishing. Includes 1 multifunctional brush for cleaning bits and preparing surfaces. Suitable for filing and finishing materials such as metal, wood, plastic, glass, ceramics and leather. Usage scenarios Metalworking and fabrication: deburring edges, refining contours, and smoothing machined parts. Woodworking and cabinetry: shaping profiles, smoothing joints, and detailing edges. General DIY and crafts: cleaning, deburring, and finishing projects involving plastic, glass, ceramic or leather components.