RS PRO, 28 Blades Thread Pitch Gauge, Imperial/Metric thread type
RS PRO, 28 Blades Thread Pitch Gauge, Imperial/Metric thread type, Sizes in Set: 11-1/2, 4, 6, 8, 10, 11, 12, 13, 16, 20, 28, 32, 40, 56, Largest Imperial Measure: 56TPI, Largest Metric Measure: 6mm, Smallest Imperial Measure: 4TPI, Smallest Metric Measure: 0.5mm