Pocket sheet metal gauge patented in 1878 and made by Brown and Sharpe Manufacturing Co., being a micrometer with a range of 0.0" to 0.375". Pocket sheet metal gauge patented in 1878 and made by Brown ...

Sheet metal is made from different materials and comes in various thicknesses, known as gauges. An easy way to remember sheet metal thickness is that the higher the gauge number, the thinner it is.