Master Mechanic, 3 Piece, All Purpose, Carbon & High Speed Steel Reciprocating Saw Blade Set, 1/2" Shank, Blades Have Heat Treated & Set Teeth. Includes: (1) 6", 6T Carbon For Cutting All Wood, Including Nail Embedded Wood, (1) 6", 18T Carbon For Cutting Nail Embedded Wood, Also For Removal, (1) 6", 14T HSS For Cutting Metal Heavier Than 1/8" Thick.