MATE-N-LOK socket, 13-17 AWG
The 163306-4 is a tin-plated socket from the TE MATE-N-LOK series, accepting 13-17 AWG wire with a crimp termination.
Wire gauge and plating across the series
The 163306-4 accepts 13-17 AWG, while the sibling 929989-8 covers 17-20 AWG and the 1-1326032-0 is a 16 AWG socket — all three share the tin-plated contact finish and crimp termination, so the choice narrows to wire gauge.