Wood 3 to 10 tpi. Large teeth, and the deep gullets between them, slice through wood efficiently. Shown: Ax, from $19 for five; Milwaukee
Wood with nails 6 to 10 tpi. Small teeth won't chip when they hit metal, but the alternating deep gullets help them chew wood. Shown: 656G, from $20 for five; Lenox Tools
Metal 10 to 24 tpi. Small teeth leave a clean cut. The blades are wide to stop wobble and thin to reduce heat buildup. Shown: Torch, from $16 for five; Milwaukee
All-purpose 6 to 10 tpi. Similar to blades for wood with nails, they're extra thick for added durability. Shown: Wrecker, from $17 for five; Milwaukee
Tip: "Keep fresh blades handy, especially when you're cutting through nails. I'll go through 12 blades a day during a major demo." —Tom Silva, TOH General Contractor
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