TAPPING AND CUTTING MADE EASY: 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 and efficient work. GCR15 ALLOY STEEL FOR METAL: Made from GCr15 alloy steel that resists contact fatigue and offers good resistance to wear and corrosion. 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 flutes taper and plug taps, as well as dies. 9 x metric taps: M3 to M12, 1 x NPT (1/8-27) socket, 9 x metric dies: M3 to M12, and 1 x NPT (1/8-27) die. ACCESSORIES AND STORAGE CASE: The kit includes 2 x tap and die handles with alloy steel bodies and adjustable fittings. All stored in a handy case to keep your tools organized and within reach.