Diablo, 25 Pack, 9'' x 8-10TPI, Metal Demolition Steel Demon Reciprocating Blades, Specifically Designed For Maximum Performance In Metal Cutting Applications, Ultra Hardened Cutting Edge Delivers Up To 5x Longer Life Than Those Of Standard Blades, Dual Tooth Design Features A Double Tooth Configuration With Small Gullets For Faster Material Removal & Extra Durability.