Gauges

American Standard Thread Ring Gauge 7/16-20 UNF NO GO Class 2A

For measuring the pitch of screw threadsBlades individually marked with pitchMedium carbon steelSupplied in storage pouch  

48 wires to measure all 60° threads from 3 to 48 threads per inch (0.5 to 6mm) Supplied in a storage pouch with wire sizes marked on pockets