This rule originated as the Goodell-Pratt No. 771 and then appears in 1930s Millers Falls catalogs as the MF 771. It is formed from tempered steel, with No. 10 graduations (64ths and 32nds). Light tarnish here, but no rust or pitting. It is a very handy rule for multiple uses in the shop. It ia in the six inch length. Good+