Ideal for mechanics, DIYer enthusiasts, and maintenance professional seeking tool for fixing internal and external threads on bolts, nut, and screws across various metalwork projects Featuring carbon steel taps and dies alongside a 40CR thread file, each tool boasts clear size markings and a hexagonal design for seamless wrench or socket compatibility, ensuring precise thread restoration Perfect for creating new threads or repairing damaged in workshops, garages, or home settings, tackling stubborn debris on bolts, nut, and screws made from cast iron, copper, or aluminum This comprehensive 15 piece metric thread repair set efficiently restores damaged, rusted, or crossed threads on most metals like steel and aluminum without compromising integrity, thanks to high hardness 45 # steel taps and dies and a 40CR thread file Stay organized with the included storage case, where each clearly labeled tap, die, and thread file has its making identification and portability, Manufacturer: Hsyzygian