If you like to work with machine tools and precision instruments, and have a keen eye for the perfect fit, you might consider being a millwright. Millwrights sometimes work to specifications requiring tolerances to a thousandth of an inch. In the old days, before heavy metal machinery, millwrights carved out gears and shafts from wood for mills and small industrial plants. Today millwrights are an elite group of construction workers who work primarily in metal and with machinery and equipment requiring precision.