5 Pack, 9" Long, 5 Teeth Per Inch, Heavy Duty, Ax Blade For Sawzall, 24 Percent Thicker Than Normal Plunge Cutting Blades, New Nail Guard 5 TPI For Faster Cuts & A Unique Design That Protects Against Tooth Fracture, New Fang Tip Bites Into Wood On First Contact For Fastest Plunge Cuts.