The new Diablo Steel Demon Bi-Metal Reciprocating Blade deliver 4x the performance of standard blades. These are the first Dual Tooth Design Bi-Metal blades with Perma-SHIELD non-stick coating and an ultra-hardened cutting edge with hardness to HRC62 for maximum durability and speed. Specifications: Length: 9" TPI: 5 Application: Pruning wood, including pressure-treated wood