Reciprocating Saw Blade, 6" Long, 6 TPI, Bi-Metal, for Nail Embedded Wood, 5 Pack Bi-metal reciprocating blades for faster cutting and added durability. Best suited for maintenance and repair work. Roughing-in work and nail embedded wood. Use with materials 3/16" (5 mm) and thicker. Bi-metal construction for faster cutting and added durability. Precision set teeth for faster, smoother cuts. 8% Cobalt keeps teeth sharp longer.