American Saw's Lenox Reciprocating Saw Blades feature bi-metal construction, an 8-percent cobalt edge, precision milled teeth, a too hardness of Rc65-66, and an angled tang. These blades are shatter resistant, with a high wear and heat resistance. Their shock resistant teeth provide a more aggressive cut. This model has 14 teeth per inch, measures 6 inches by 3/4-inch by .035, and is intended for work with heavy gage metal (1/4 - 1/2-inch thick), hard rubber, fiber and angle iron.