LENOX Tools Metal Cutting Reciprocating Saw Blade with Power Blast Technology, Bi-Metal, 8-inch, 18 TPI, 25/PK N/A Imported Bi-metal construction for durability and long life Power Blast Technology strengthens the blade to reduce breaks Versatile blade cuts easily through thin and medium metals T2 Technology allows efficient cutting in the widest range of materials T2 technology tooth design delivers up to twice the life and cuts heavy materials more easily Bi-metal construction allows blades to bend and flex without breaking Designed to minimize friction and heat build-up while cutting through the widest variety of metal materials 18 tooth per inch blades are best for use with medium-thickness metals