Features: The thicker item you want to cut, the thinner saw blade should be. It is suggested that use #1, #2, #3 saw blade to saw the metal; #4 #5 #6 #7 is suitable for wood sawing; #8 can be applied on sawing plastic. Sharp tooth resists loading and improves cutting speeds. Forged from high carbon steel, through fine process, with high hardness and strength. This package is a total of 12pcs saw blade, convenient to replace the broken or worn one. Curve sawing is very relaxed, the blade is not stuck. Specification: Material: Carbon SteelOptions: #1, #2, #3, #4, #5, #6, #7, #8 (The diameters are sorted from small to large)Quantity: 12pcs/set Size: Approx. 13 * 0.1 * 0.1cm / 5.12 * 0.04 * 0.04inch Weight: 4 - 11gType: Saw BladesPackage List:1 * Set of 12 Saw Blades.