These are the top quality scroll saw blades woodworkers ask for by name - OLSON! These 5" metal cutting scroll saw blades are made for power scroll saws or hand held frames. These blades are made from hardened and tempered steel and have more teeth per inch than regular scroll saw blades for cutting thin metal and other hard materials. Universal No. = 1, Width =.024", Thickness =.012", tpi = 48 teeth per inch. Recommended for use with materials 1/16" thickness or for metals with a thickness of .060".