TAPPING AND CUTTING MADE EASIER: Easily tap new material or repair slightly damaged threads, such as rusted screws, nuts, and bolts, with the Hi-Spec tap and die set. Ideal for home, garage, or workshop use. THREADING, FORMING, AND PINCHING: Clean and restore old, broken, or damaged threads with this tap and die set. Taps cut internal threads, and dies cut external threads. Use these cutting tools with cutting oils for fast, efficient work. GCR15 METAL-CUTTING ALLOY STEEL: Made from GCr15 alloy steel that resists contact fatigue and offers good wear and corrosion resistance. This tap and die set is suitable for tapping and threading carbon alloy steel, cast iron, aluminum, brass, and bronze. 18-PIECE METRIC TAP AND DIE SET: Includes the most common thread sizes and pitches with three- and four-flute taper and plug taps, as well as dies. 9 x metric taps: M3 to M12, 1 x NPT (1/8-27) plug, 9 x metric dies: M3 to M12, and 1 x NPT (1/8-27) die. ACCESSORIES AND STORAGE CASE: The kit