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.