These 12 piece economy needle file sets are ideal for filing rough metal surfaces. These needle files work wonderfully for a variety of jewelry making applications. They can be used to file rough edges on metal beads and findings, or even to shape and detail polymer clay & PMC before and after firing. Their small size also makes them ideal for getting into confined spaces. The files are made of high grade steel and measure approximately 2mm X 100mm Set Includes these shapes: 2 Round, 2 Triangle, 1 Knife, 1 Oval, 4 Flat (2 blunt/2 tapered), 1 Half Round and 1 Square