Spurtar Top Post Battery Isolator Switch 12V - 24V Kill Switch Battery Disconnect Terminal for Car Truck RV Boat Vehicles, 2PCS

In the description it says "Brass battery switch made of heavy duty solid brass", but when I had to file down a rise, the brass came off?

How did you connect your original cable "to" this? Its just a hole on that end!

Will this work for a 48 volt golf cart set up?

Would this work on a hybrid 2007 Saturn aura?