The Blue Spot Tools 5 PCE 300mm (12") 24 TPI hacksaw blades are manufactured from heat treated Carbon steel for an increased cutting performance and hardness, with 24 teeth per inch making them ideal for cutting metal, plastic and certain types of wood. The blades are 300mm (12") in length and will fit most 300mm (12") hacksaw frames. Manufactured from heat treated carbon steel for increased durability Heat treated for hardness Suitable for most 300mm (12") hacksaws 24 TPI For cutting metal, plastic and certain types of wood Package Contents 5 x heat treated carbon steel hacksaw blades.