1. Forged Alloy Steel 4 precision files are made from T12 drop forged alloy steel, and 12 needle files are crafted from GCR15 bearing steel. temperature quenching on the file surfaces results in higher strength and wear resistance. 2. Value Pack: 17 piece file set, including 4 large 20.3 cm engineer files in flat, half round, and round shapes, and 12 precise 10.7 cm needle files in square, round taper, equaling, ring, warding, and triangular shapes, plus 1 multi functional brush for cleaning bits and filing materials like metal, wood, plastic, glass, ceramic, and leather. 3. Comfortable and Secure Grips: The soft rubber handles provide the grip on each file, allowing you to work longer without fatigue. 4. Portable Tool Pouch: This hand file set comes with a tool pouch that helps organize and protect the mini files and larger files.