• Threads per Inch (TPI): 3 - 48
• Pitch (mm): 0.5 - 6
• Number of Pieces: 48
• 48 wires - 16 different sizes. • Measures all threads from 3 - 48 threads per inch. • Measures all metric threads from 0.5 mm to 6 mm. • Also measures ACME threads. • Laminated chart included.