.036 ZZ Pin Gage – Vermont Gage – Made In USA

Description Used to determine if the inside diameter (orifice) of a vent-liner has opened enough (.036″ or larger) that it should be replaced.  If this pin passes through, replace the vent liner.   Made in USA by Vermont Gage. Replace vent liners when the 036 gage pin passes through. Many uses for measuring holes/orifices beyond muzzle loading (automotive applications, etc).