For speed, straightness of cut, long life and safety, these bi-metal 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 for longer life. Blades cut steel, stainless steel, copper, aluminum and harder plastics like PVC and ABS.