A nice touch is the heavy duty rating printed clearly, so you know it is ready for demanding circuits.
2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets
It's practical that they come as a 2 pack for anyone working on small builds.
This unit carries the Schneider Electric brand, and you will find that it lines up with familiar product families.