The LenoxTools 20150S018HE Bi-Metal 10-Inch 18TPI Hacksaw Blades for use on Heavy Metal, 1-Pack is ideal for a quick metal cutting job. The LenoxHack 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 flexwithout shattering and the high speed steel gives you a superior cutting edge for long life. The Lenoxblades feature the LenoxTough Tooth Design which helps eliminate tooth strip page. These blades work with LenoxHack Saw frames as well as most other Hack Saw Frames in the Market.