Dial Indicators, Micrometers, Calipers manufacturer / supplier in China, offering 3/4-16unf-3b Thread Plug Gauge for Checking Threaded or Tapped Holes, Go/No Go 1/4-28 Unf-3b Thread Plug Gauge with High Precision, 1/2 -20 Unf-3b Plug Thread Gauge with Go/No Go Type and so on.