1The 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 2Sharp tooth resists loading and improves cutting speeds 3Forged from high carbon steel, through fine process, with high hardness and strength 4This package is a total of 12pcs saw blade, convenient to replace the broken or worn one 5Curve sawing is very relaxed, the blade is not stuck