Portland Saw - Jig Saw Blades, 5 Pc. Mixed Set, Three Wood Blades: Wood (fast cutting) - 6 Teeth Per Inch Clean; Wood - 10 Teeth Per Inch (+ Reverse 10 Teeth Per Inch) & 20 Teeth Per Inch & One Medium Metal Blade: 21 Teeth Per InchIncludes most common blades for normal applications. High precision wood cutting blades make fast, clean cuts.Bi-Metal material for long lasting metal cutting blade.