Diablo Steel Demon, 6" x 8/10 TPI, Reciprocating Blade, Demolition Metal Cutting, Delivers 4 Times The Life Of Standard Bi-Metal Reciprocating Blade, Features A Hardened Tooth Technology For Superior Durability In Extreme Applications, Perma-Shield Coating For Reduced Heat & Friction, Dual Tooth Design For Better Control, Bulk.