Screw Pitch Gage, Inch 51 Leaves 

Correct pitch is determined by matching blade teeth with threads. Each blade clearly marked with proper thread size. Blades are protected in sturdy steel case.

Includes the following TPI:

Leave Sizes: 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 11.5, 12, 13, 14, 15,16, 18, 20,22, 24, 25, 27, 28, 30, 32, 34 threads per inch (TPI)

Leave Sizes: 36, 38, 40,42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84 threads per inch (TPI)