Product Description 20565S614R - Recips S614R 6 X3/4X035X14 1/Pk High speed blasting along the cutting edge strengthens the blade to reduce breaks and increase durability Patented T2 Technology reduces cutting forces on each tooth and optimizes chip removal to allow efficient cutting in the widest range of materials. From the Manufacturer 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.