The Lenox 6" Bi-Metal Reciprocating Saw Blade (5 Pack) (20564-614R) features bi-metal construction, an 8-percent cobalt edge, precision milled teeth, 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 is intended for work with heavy gauge metal (1/4 - 1/2-inch thick), hard rubber, fiber and angle iron.