This is a 4 pin replacement connector for typical spindles used in CNC routers and CNC machines.
The dimensions of this female 4 pin spindle connector is:
Pin spacing (pitch): 0.2" (5.08mm)Overall Length: 1.92" (48.77mm)
This is the part of the connector that is connected to the cable that is connected to the VFD (Variable Frequency Drive). There are four cup-like solder terminals inside this connector.