Manufactured from hardened and tempered high carbon steel. Ideal for forming threads in soft materials or clearing damaged/corroded threads. Set supplied in a convenient storage case and contains: Tap & Dies Sizes: 3x0.5, 4x0.7, 5x0.8, 6x1.0, 7x1.0, 8x1.25, 10x1.5, 12x1.75mm 1/8" NPT. Tap wrench. Die stock. Screwdriver.