• Each size has a nut and bolt checker on the same gauge. 23 of the most common SAE/Inch sizes!
  • Thread sizes are permanently stamped (in red) onto each gauge.
  • Wire cable with loop for convenient hanging.
  • The individual gauges rotate freely on the wire cable for fast thread verification.
  • Gauges are a zinc plated high grade steel.
  • SWTC-S21 Size Specifications:6-32, 6-40, 8-32, 10-24, 10-32, ¼-20, ¼-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, ½-13, ½-20, 9/16-12, 9/16-18, 5/8-11, 5/8-18, ¾-10, ¾-16, 1-8, 1-12
  • Made in USA!