The Lenox Tools 20161T224HE Bi-Metal 12-Inch 24TPI Hacksaw Blades for use on Medium Metal - 2 Pack is ideal for a quick metal cutting job. The Lenox Hack Saw Blades are bi-metal and have a spring steel body and a high speed steel cutting edge. This construction allows the blades to bend and flex without shattering and the high speed steel gives you a superior cutting edge for long life. The Lenox blades feature the Lenox Tough Tooth Design which helps eliminate tooth strip page. These blades work with Lenox Hack Saw frames as well as most other Hack Saw Frames in the Market.