Starrett 281 - American Standard Wire Gage
The Starrett 281 is a generally accepted standard for non-ferrous metals as adopted by brass manufacturers. It is especially useful for electricians and others to gage sheets, plates and wire made of non-ferrous metals like copper, brass, aluminum, etc. Screw slotting cutters are also made to this gage. Gage has decimal equivalents on the reverse side. Satin finish.