The HK1228 is a high-tension style hack saw. Bi-metal blades have a high speed steel cutting edge and are electron-beam welded to alloy steel back, with wavy set. When used with high-tension frames, bi-metal blades provide best performance and safety. Blades and hack saw frames are interchangeable with Stanley®, Lenox®, Starrett®, M.K. Morse® and Ridgid®, among others.