Reed's BH18 is a High-Tension Bi-Metal Blade (package of 10). It weighs .5 lbs. This high-tension style hack saw blade is constructed of sturdy bi-metal materials that gives you a high-speed steel cutting edge, and is electron-beam welded to alloy steel back, with wavy set. This blade is interchangeable with Stanley, Lenox, Starrett, M.K. Morse, and Ridgid, among others.