The heavy duty feel comes from thicker metal and firm mounting tabs that do not flex under pressure.
100 Panasonic LKP1AF-24V PCB Relay SPST General Purpose 24Vdc 10A@30Vdc/277VAC
What stands out about this Omron relay is the smooth mechanical action and tidy labeling.
You will see the SRD-12VDC-SL-C code stamped on the side of the relay.