Craftsman 8 pc. Reciprocating Saw Blade Set, Multi-Purpose, 6TPI  9-66410 Cuts wood, nails, metal, Bi-metal construction All blades are 6" long, The blades are of durable, flexible bi-metal The set includes 2 6TPI wood-cutting blades (#66385), 2 6TPI wood/nail-cutting bi-metal blades, a 4TPI metal-cutting (#66380), 2 18TPI metal-cutting bi-metal blades (#66382) and a 10/14TPI multi-purpose blade (#66388)