M. K. Morse RB818T25 8-Inch by 3/4-Inch by 0.035-Inch 18 TPI Bi-metal Reciprocating saw blade for metal cutting, 25-pack. These extra-tough, profession quality blades are available for a variety of uses including wood, metal, plastics, fiberglass, plaster and other common building materials. We laser weld the Matrix II cutting edge to the backer at our manufacturing plant in Canton, Ohio so that we can control the process and guarantee professional quality reciprocating blades. These are the blades good enough to be called Morse