Technical Data:
Series: 188
Product type: Whitworth Screw Pitch Gage 55 deg
Range: 4 - 42 TPI
Thread pitch size stamped on each gage

Content:
30 leaves: 4, 4-1/2, 5, 5-1/2, 6, 7, 8, 9, 10, 11, 11-1/2, 12, 13, 14, 15, 16, 18, 20, 22, 24, 26, 27, 28, 30, 32, 34, 36, 38, 40, 42 TPI