The M39029/57-358 is a Circular Socket Contact with 20 to 16AWG wire range and orange/green/gray bin code. This MIL-DTL-38999 series contact is designed to meet MIL-C-39029 or MIL-C-29600 standards and can transfer power and/or signal.
Pilots HQ responded promptly to my order. They were delivered on time and pricing was reasonable. I would order from them again. Top notch company, very professional.