Steel Demon, 5 Pack, 9", 20/24 Tooth, Metal Reciprocating Saw Blade, Full Contact Arched Edge Design For Faster Cuts In Fewer Passes Resulting In Less Heat Build-Up To Deliver 5X Longer Cutting Performance, Dual Tooth Design For Faster Material Removal & Extra Durability, Perma-Shield Coating Protects The Blade From Heat, Gumming & Corrosion, 1" Demolition Body For Straighter Cuts With Less Vibration, Ideal For Medium Metal Cutting Applications With A 3/32" - 5/16" Thickness.