My buddy purchased an extremely similar looking 200 amp solenoid.
When it arrived I was disappointed in the size of the main terminals. Fitting a 4gauge thick walled ring terminal on them, a very small portion of that would actually be passing the current and they are so close together than making tight fitting copper washers to slide over ~3/16 diameter studs to increase surface area would be kind of pointless.
I most recently employed
Cole Hersee 24213 12V 200A Continuous Solenoid, that claims to have silver tungsten carbide internal contacts.At least it has 5/16" studs that thick walled ring terminals did not completely dwarf.
