40.750 inch to 1.000 inch inside deminsion; primary currents dc to 600.0 hz: 200.0 amps, 400.0 hz: 200.0 amps, rf (w): 16.0 amps, pulse: 70 amps; operating temp minus 40.0 degrees f to plus 160.0 degrees f; storage temp minus 80.0 degrees f to plus 160.0 degrees f