For speed, straightness of cut, long life and safety, these bi-metal, portable, power hack saw blades are the best choice for the REED saw it and heavy-duty power hack saws made by Widder, Fein, and Spitznas. The extra blade depth (1 3/8") and the matrix high-speed steel (HSS) cutting edge allow a straighter cut. Bi-Metal blade construction reduces the tendency of solid HSS blades to shatter. Wavy set and high tooth hardness yield longer life blade life. Portable power hack saw blades cut copper, steel, stainless steel, aluminum, and harder plastics like PVC and abs.2Cuts copper, steel, stainless steel and aluminum | Great for use on harder plastics like PVC and abs | Blades from 8" to 30" long available | The matrix HSS cutting edge guarantee superior performance | Bimetal construction reduces the tendency of solid HSS blades to shatter