Master Mechanic, 5 Piece, 12", Bi-Metal Hacksaw Blade Set, Consists Of: (2) 18 Tooth, (2) 24 Tooth & (1) 32 Tooth Hacksaw Blades, Shatterproof, Virtually Indestructible, Industrial Quality, Particularly Recommended For Cutting Higher Carbon Or Alloy Steels, Bi-Metal Steel Combines Toughness With Flexibility For Heavy Duty Cutting, Lasts 10 Times Longer Than Carbon Blades.