Code : Limit Plug Gauges
Brand : Swan
Plug gauge are two types for inspection and working, inspect the inner diameter of the hole in the workpiece to determine if it is made on the size of the default.
Blind side If there is still no entry street side enters, the inner diameter of the hole is a pass.
There are both single-ended and mouth shape, usually, the material is special steels tungsten carbide high wear-resistant, hard chrome-plated, Tin also made coding I produce.