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0.25-6mm/4-62 TPI Metric 60° and Whitworth 55° Pitch Gauge - 4820 Series (Insize)
The Insize 4820 Pitch Gauges for measuring the pitch or lead of a screw thread. The Gauge is made of carbon steel so it does not damage the thread. Metric 60 degree 0.25-7mm and whitworth 55 degree 4-62 TPI.