Saw Blade Application: Specially designed carbide and blade geometry for cutting aluminum & non-ferrous metal bars and relatively thick-walled extrusions & profiles. Under certain conditions these versatile saw blades can also be used to cut other 'difficult' materials such as plastic PVC tubing and fiberglass. When cutting non-ferrous metals a coolant or blade wax should be used and proper clamping devices employed. WARNING! : NEVER attempt to cut ferrous metals (steel iron etc.) with these saw blades.