Thread Pitch Gauge Set Included Threads per Inch 1 TPI 1 1/3 TPI 1 1/2 TPI 1 3/4 TPI 2 TPI 2 1/2 TPI 3 TPI 3 1/2 TPI 4 TPI 5 TPI 6 TPI 7 TPI 8 TPI 9 TPI 10 TPI 12 TPI Maximum Thread Pitch - mm 12 Minimum Thread Pitch - mm 1 Number of Leaves 16 Thread Angle 29 Degrees Thread Type ACME Gauge Material Steel